Latest Firefox released for Windows


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Firefox Release Version: 153.0.1
Release Date: July 27, 2026

FTP Download Page:
(32-bit) Directory Listing: /pub/firefox/releases/153.0.1/win32/en-US/
(64-bit) Directory Listing: /pub/firefox/releases/153.0.1/win64/en-US/

32-bit and 64-bit Download Page: Mozilla Firefox Web Browser - Download Firefox in your language - Mozilla

Release Notes: Firefox Release Notes




Firefox Release Candidate Version: 153.0.1 Build 1 (RC1)
Release Date: July 27, 2026

FTP Download Page:
(32-bit) Directory Listing: /pub/firefox/candidates/153.0.1-candidates/build1/win32/en-US/
(64-bit) Directory Listing: /pub/firefox/candidates/153.0.1-candidates/build1/win64/en-US/

Directory Listing: Directory Listing: /pub/firefox/candidates/




Firefox BETA Version: 154.0b5
Release Date: July 31, 2026

FTP Download Page:
(32-bit) Directory Listing: /pub/firefox/releases/154.0b5/win32/en-US/
(64-bit) Directory Listing: /pub/firefox/releases/154.0b5/win64/en-US/

32-bit and 64-bit Download Page: Mozilla Firefox Beta Web Browser - Download Firefox Beta in your language - Mozilla

Release Notes: Firefox Release Notes




Firefox Nightly Version: 155.0a1
Release Date: July 20, 2026

32-bit and 64-bit Download Page: Mozilla Firefox Nightly Web Browser - Download Firefox Nightly in your language - Mozilla

FTP Download Page: Directory Listing: /pub/firefox/nightly/mozilla-central/

Release Notes: Firefox Nightly Release Notes

 
Last edited:
Good gosh! I must say, Firefox knows how to render a 4K Ultrawide PIP in full screen!!! (y)

11001.webp
 

My Computers My Computers

  • At a glance

    Windows 11 Pro
    OS
    Windows 11 Pro
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASUS ROG Strix
  • At a glance

    Windows 11 Pro
    Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    ASUS VivoBook
  • ASUS VivoBook 'Lite' ~ Windows 11 Home
Today Firefox updated to 145. Once serious bug is when pressing F11 to go full screen it crashes. Always, every single time. I have read older internet sites suggesting to turn off hardware acceleration. This is not ideal, is there any other solution, or should I wait for the next update? Thanks.

PS: After too many attempts it seems F11 or clicking on the [] icon enables full screen successfully, but once I close Firefox and open it again it crashes. It works only occasionally. Disabling hardware acceleration made no difference. If developers read this, please issue a patch to fix it. Thanks.
It works just fine for me.
 

My Computers My Computers

  • At a glance

    Windows11 Pro 26200.8973Intel Core i9 14900F (24 -Core, 68 MB Total C...32GB DDR5RTX 4080 Super w/610.74
    OS
    Windows11 Pro 26200.8973
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Alienware Aurora R16
    CPU
    Intel Core i9 14900F (24 -Core, 68 MB Total Cache)
    Motherboard
    Dell Alienware
    Memory
    32GB DDR5
    Graphics Card(s)
    RTX 4080 Super w/610.74
    Sound Card
    Realtec
    Monitor(s) Displays
    Corsair XENEON 32QHD165
    Screen Resolution
    2560 X 1440
    Hard Drives
    1-2TB Samsung 990 Pro PCIe NVMe M2 SSD
    1-4TB Samsung 990 Pro PCIe NVMe M2 SSD
    PSU
    1000 Watt Platinum Dell
    Case
    Alienware
    Cooling
    Liquid Closed Loop
    Keyboard
    Corsair Strafe RGB
    Mouse
    Logitech MK270 Wireless
    Internet Speed
    100Gb's Down-20 Up
    Browser
    Firefox 153.0.1
    Antivirus
    Defender
    Other Info
    Very Quiet And Fast
    CyberPower UPS CP1500PFCLCD
  • At a glance

    PClinuxOS Mate (2025.7)13th Gen Inter(R) Core(TM) i3-1315U64 GB DDR4 @3200 MHz.Internal
    Operating System
    PClinuxOS Mate (2025.7)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Intel
    CPU
    13th Gen Inter(R) Core(TM) i3-1315U
    Motherboard
    Intel
    Memory
    64 GB DDR4 @3200 MHz.
    Graphics card(s)
    Internal
    Sound Card
    None
    Monitor(s) Displays
    Dell 2419HGCF
    Screen Resolution
    1920 X 1080
    Hard Drives
    SAMSUNG 980 PRO SSD 2TB, PCIe 4.0 M.2 2280
    PSU
    Chicony 30 Watt
    Case
    Small
    Keyboard
    Dell
    Mouse
    Razor
    Internet Speed
    1GB
    Browser
    Slimjet
It works just fine for me.
Ditto, except I had to change the default DNS settings in windows in order to get FF to stop freezing up from time to time. Windows logs are full of DNS errors "error loading the SSL libraries"
 

My Computer My Computer

At a glance

Windows 11 22H2 Pro (X-lite Micro 11 version)i7 13850HX (20 cores, 28 threads)32GB DDR5Intel UHD/ RTX 1000 ADA
OS
Windows 11 22H2 Pro (X-lite Micro 11 version)
Computer type
Laptop
Manufacturer/Model
Dell/ Precision 7680
CPU
i7 13850HX (20 cores, 28 threads)
Motherboard
Dell
Memory
32GB DDR5
Graphics Card(s)
Intel UHD/ RTX 1000 ADA
Sound Card
Realtek
Monitor(s) Displays
4K UHD Touchscreen
Screen Resolution
3840 x 2400
Hard Drives
Samsung 512GB system drive
WD Blue 1TB game drive
PSU
240W AC adapter, 1800W when docked
Internet Speed
1 gigabit symmetrical
Browser
Firefox, Librewolf
Antivirus
None. Manully configured so nobody except me can change any critical system files. (Don't ask how, it's probably against some rule somewhere)
No issues with F11 and nothing in the logs related to DNS.
I do not allow Firefox to handle DNS settings as my router (RT-BE86U) can do a better job so everything is off in Firefox.

Screenshot 2025-11-15 132546.webp
 

My Computer My Computer

At a glance

Windows 11 Pro
OS
Windows 11 Pro
 

My Computers My Computers

  • At a glance

    Windows 11 Pro for WorkstationsIntel i7-8700K 5 GHz64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600...ASUS ROG-STRIX-GTX1080TI-O11G-GAMING (11GB GD...
    OS
    Windows 11 Pro for Workstations
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom self build
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600 MHz (F4-3600C18D-32GTZR)
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING (11GB GDDR5X)
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G75 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 990 PRO M.2,
    4TB Samsung 990 PRO M.2,
    TerraMaster F8 SSD Plus NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3 wall mounted
    Cooling
    Corsair Hydro H115i
    Keyboard
    Amazon Basics Wired Full Keyboard MD005
    Mouse
    Logitech MX Master 4
    Internet Speed
    2 Gbps Download and 100 Mbps Upload
    Browser
    Chrome and Edge
    Antivirus
    Microsoft Defender
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    CyberPower CP1500PFCLCD
    Galaxy S23 Plus phone
  • At a glance

    Windows 11 ProSnapdragon X Elite (12 core) 3.42 GHz16 GB LPDDR5x-7467 MHz
    Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Surface Laptop 7 Copilot+ PC
    CPU
    Snapdragon X Elite (12 core) 3.42 GHz
    Memory
    16 GB LPDDR5x-7467 MHz
    Monitor(s) Displays
    15" HDR
    Screen Resolution
    2496 x 1664
    Hard Drives
    1 TB SSD
    Internet Speed
    Wi-Fi 7 and Bluetooth 5.4
    Browser
    Chrome and Edge
    Antivirus
    Microsoft Defender

My Computer My Computer

At a glance

Windows 11 ProIntel Core i9 12900KFCorsair 64GB DDR5 Vengeance C40 5200MhzASUS GeForce RTX 3090 ROG Strix OC 24GB
OS
Windows 11 Pro
Computer type
PC/Desktop
Manufacturer/Model
Custom Build
CPU
Intel Core i9 12900KF
Motherboard
ASUS ROG Maximus Z690 Hero
Memory
Corsair 64GB DDR5 Vengeance C40 5200Mhz
Graphics Card(s)
ASUS GeForce RTX 3090 ROG Strix OC 24GB
Sound Card
OnBoard
Monitor(s) Displays
Acer Predator XB323UGP 32" QHD G-SYNC-C 144Hz 1MS IPS LED
Screen Resolution
2560 x 1440
Hard Drives
1x Samsung 980 Pro Series Gen4 250GB M.2 NVMe
1x Samsung 980 Pro Series Gen4 500GB M.2 NVMe
2x Samsung 980 Pro Series Gen4 2TB M.2 NVMe
PSU
Corsair AX1200i 1200W 80PLUS Titanium Modular
Case
Corsair 4000D Black Case w/ Tempered Glass Side Panel
Cooling
Noctua NH-U12A Chromax Black CPU Cooler, 4x Noctua 120mm Fans
Keyboard
Logitech MK545
Mouse
Logitech MX Master 3
Internet Speed
Fixed Wireless 150mbps/75mbps
Browser
Firefox
Antivirus
Kaspersky
Other Info
Thrustmaster TS-PC RACER
Fanatec CSL Elite Pedals with the Load Cell Kit
Yamaha Amp with Bose Speakers

My Computers My Computers

  • At a glance

    Windows 11 Pro for WorkstationsIntel i7-8700K 5 GHz64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600...ASUS ROG-STRIX-GTX1080TI-O11G-GAMING (11GB GD...
    OS
    Windows 11 Pro for Workstations
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom self build
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600 MHz (F4-3600C18D-32GTZR)
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING (11GB GDDR5X)
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G75 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 990 PRO M.2,
    4TB Samsung 990 PRO M.2,
    TerraMaster F8 SSD Plus NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3 wall mounted
    Cooling
    Corsair Hydro H115i
    Keyboard
    Amazon Basics Wired Full Keyboard MD005
    Mouse
    Logitech MX Master 4
    Internet Speed
    2 Gbps Download and 100 Mbps Upload
    Browser
    Chrome and Edge
    Antivirus
    Microsoft Defender
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    CyberPower CP1500PFCLCD
    Galaxy S23 Plus phone
  • At a glance

    Windows 11 ProSnapdragon X Elite (12 core) 3.42 GHz16 GB LPDDR5x-7467 MHz
    Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Surface Laptop 7 Copilot+ PC
    CPU
    Snapdragon X Elite (12 core) 3.42 GHz
    Memory
    16 GB LPDDR5x-7467 MHz
    Monitor(s) Displays
    15" HDR
    Screen Resolution
    2496 x 1664
    Hard Drives
    1 TB SSD
    Internet Speed
    Wi-Fi 7 and Bluetooth 5.4
    Browser
    Chrome and Edge
    Antivirus
    Microsoft Defender
New Firefox WHQL version 145.0.1 released. See first post for more details. :alien:
 

My Computers My Computers

  • At a glance

    Windows 11 Pro for WorkstationsIntel i7-8700K 5 GHz64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600...ASUS ROG-STRIX-GTX1080TI-O11G-GAMING (11GB GD...
    OS
    Windows 11 Pro for Workstations
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom self build
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600 MHz (F4-3600C18D-32GTZR)
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING (11GB GDDR5X)
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G75 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 990 PRO M.2,
    4TB Samsung 990 PRO M.2,
    TerraMaster F8 SSD Plus NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3 wall mounted
    Cooling
    Corsair Hydro H115i
    Keyboard
    Amazon Basics Wired Full Keyboard MD005
    Mouse
    Logitech MX Master 4
    Internet Speed
    2 Gbps Download and 100 Mbps Upload
    Browser
    Chrome and Edge
    Antivirus
    Microsoft Defender
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    CyberPower CP1500PFCLCD
    Galaxy S23 Plus phone
  • At a glance

    Windows 11 ProSnapdragon X Elite (12 core) 3.42 GHz16 GB LPDDR5x-7467 MHz
    Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Surface Laptop 7 Copilot+ PC
    CPU
    Snapdragon X Elite (12 core) 3.42 GHz
    Memory
    16 GB LPDDR5x-7467 MHz
    Monitor(s) Displays
    15" HDR
    Screen Resolution
    2496 x 1664
    Hard Drives
    1 TB SSD
    Internet Speed
    Wi-Fi 7 and Bluetooth 5.4
    Browser
    Chrome and Edge
    Antivirus
    Microsoft Defender
I updated from 145 to 145.0.1 Unfortunately it still crashes when I press F11 or click on the [] icon to go full screen. Useless if I want to watch Netflix or whatever. Thankfully good old Microsoft Edge doesn't suffer from this bug. If any Developer reads this, please fix this bug!
 

My Computers My Computers

  • At a glance

    Windows 11 Pro 23H2 (5699), 25H2 (8875)Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz4GBMobile Intel(R) GMA 4500M (Mobile 4 series)
    OS
    Windows 11 Pro 23H2 (5699), 25H2 (8875)
    Computer type
    Laptop
    Manufacturer/Model
    Acer Extensa 5630EZ
    CPU
    Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz
    Motherboard
    Acer Extensa 5630
    Memory
    4GB
    Graphics Card(s)
    Mobile Intel(R) GMA 4500M (Mobile 4 series)
    Sound Card
    Realtek ALC268 @ Intel 82801IB ICH9 - High Definition Audio Controller
    Monitor(s) Displays
    1
    Screen Resolution
    1280x800
    Hard Drives
    Samsung SSD 850 EVO 250GB SATA Device (250 GB, SATA-III)
    Internet Speed
    VDSL 50 Mbps
    Browser
    MICROSOFT EDGE
    Antivirus
    WINDOWS DEFENDER
    Other Info
    Legacy MBR installation, no TPM, no Secure Boot, no WDDM 2.0 graphics drivers, no SSE4.2, cannot get more unsupported ;) This is only my test laptop. I had installed Windows 11 here before upgrading my main PC. For my main PC I use everyday see my 2nd system specs.
  • At a glance

    Windows 11 Pro v25H2 (build 26200.8875)Intel Core-i7 3770 3.40GHz s1155 (3rd generat...2x Kingston Hyper-X Blu 8GB DDR3-1600GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB...
    Operating System
    Windows 11 Pro v25H2 (build 26200.8875)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom-built PC
    CPU
    Intel Core-i7 3770 3.40GHz s1155 (3rd generation)
    Motherboard
    Asus P8H61 s1155 ATX
    Memory
    2x Kingston Hyper-X Blu 8GB DDR3-1600
    Graphics card(s)
    GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB (GV-N3050WF2OCV2-6GD)
    Sound Card
    Realtek HD audio (ALC887)
    Monitor(s) Displays
    Sony Bravia KDL-19L4000 19" LCD TV via VGA
    Screen Resolution
    1440x900 32-bit 60Hz
    Hard Drives
    WD Blue SA510 2.5 1000GB SSD as system disk, Western Digital Caviar Purple 4TB SATA III (WD40PURZ) as second
    PSU
    Thermaltake Litepower RGB 550W Full Wired
    Case
    SUPERCASE MIDI-TOWER
    Cooling
    Deepcool Gamma Archer CPU cooler, 1x 8cm fan at the back
    Keyboard
    Mitsumi 101-key PS/2
    Mouse
    Sunnyline OptiEye PS/2
    Internet Speed
    100Mbps
    Browser
    Microsoft Edge, Mozilla Firefox
    Antivirus
    Microsoft Windows Defender
    Other Info
    Legacy BIOS (MBR) installation, no TPM, no Secure Boot, WDDM 3.0 graphics drivers, WEI score 7.4
New Firefox Beta version 146.0b5 released. See first post for more details. :alien:
 

My Computers My Computers

  • At a glance

    Windows 11 Pro for WorkstationsIntel i7-8700K 5 GHz64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600...ASUS ROG-STRIX-GTX1080TI-O11G-GAMING (11GB GD...
    OS
    Windows 11 Pro for Workstations
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom self build
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    64 GB (4x16GB) G.SKILL TridentZ RGB DDR4 3600 MHz (F4-3600C18D-32GTZR)
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING (11GB GDDR5X)
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G75 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 990 PRO M.2,
    4TB Samsung 990 PRO M.2,
    TerraMaster F8 SSD Plus NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3 wall mounted
    Cooling
    Corsair Hydro H115i
    Keyboard
    Amazon Basics Wired Full Keyboard MD005
    Mouse
    Logitech MX Master 4
    Internet Speed
    2 Gbps Download and 100 Mbps Upload
    Browser
    Chrome and Edge
    Antivirus
    Microsoft Defender
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    CyberPower CP1500PFCLCD
    Galaxy S23 Plus phone
  • At a glance

    Windows 11 ProSnapdragon X Elite (12 core) 3.42 GHz16 GB LPDDR5x-7467 MHz
    Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Surface Laptop 7 Copilot+ PC
    CPU
    Snapdragon X Elite (12 core) 3.42 GHz
    Memory
    16 GB LPDDR5x-7467 MHz
    Monitor(s) Displays
    15" HDR
    Screen Resolution
    2496 x 1664
    Hard Drives
    1 TB SSD
    Internet Speed
    Wi-Fi 7 and Bluetooth 5.4
    Browser
    Chrome and Edge
    Antivirus
    Microsoft Defender
No issues with F11 and nothing in the logs related to DNS.
I do not allow Firefox to handle DNS settings as my router (RT-BE86U) can do a better job so everything is off in Firefox.

View attachment 153114

is it risky to close? How to check if my router handling dns or nah?
 

My Computers My Computers

  • At a glance

    windows 11 home 23H2 22631.6199Intel core i7 (2nd gen) Turbo 3.10 ghz6gbAmd Radeon HD 7400m 1GB & Intel hd graphics
    OS
    windows 11 home 23H2 22631.6199
    Computer type
    Laptop
    Manufacturer/Model
    HP
    CPU
    Intel core i7 (2nd gen) Turbo 3.10 ghz
    Memory
    6gb
    Graphics Card(s)
    Amd Radeon HD 7400m 1GB & Intel hd graphics
    Sound Card
    BeatsAudio
    Hard Drives
    128gb SSD
  • At a glance

    macOS SequoiaM1 3.2 ghz8gb onboardigpu
    Operating System
    macOS Sequoia
    Computer type
    PC/Desktop
    Manufacturer/Model
    iMac 24"
    CPU
    M1 3.2 ghz
    Memory
    8gb onboard
    Graphics card(s)
    igpu
    Monitor(s) Displays
    Retina 4.5K
    Screen Resolution
    4480x2520
    Hard Drives
    512gb SSD
Today Firefox updated to 145. Once serious bug is when pressing F11 to go full screen it crashes. Always, every single time. I have read older internet sites suggesting to turn off hardware acceleration. This is not ideal, is there any other solution, or should I wait for the next update? Thanks.

PS: After too many attempts it seems F11 or clicking on the [] icon enables full screen successfully, but once I close Firefox and open it again it crashes. It works only occasionally. Disabling hardware acceleration made no difference. If developers read this, please issue a patch to fix it. Thanks.
im not having any type of issue like this both on 145 or 145.1. F11 full screen working perfectly fine, tried opening closing multiple times no crash after. I like firefox because you can add full screen button shortcut on toolbar. Just one click very easy, i can't do that on edge or brave 😔
 

My Computers My Computers

  • At a glance

    windows 11 home 23H2 22631.6199Intel core i7 (2nd gen) Turbo 3.10 ghz6gbAmd Radeon HD 7400m 1GB & Intel hd graphics
    OS
    windows 11 home 23H2 22631.6199
    Computer type
    Laptop
    Manufacturer/Model
    HP
    CPU
    Intel core i7 (2nd gen) Turbo 3.10 ghz
    Memory
    6gb
    Graphics Card(s)
    Amd Radeon HD 7400m 1GB & Intel hd graphics
    Sound Card
    BeatsAudio
    Hard Drives
    128gb SSD
  • At a glance

    macOS SequoiaM1 3.2 ghz8gb onboardigpu
    Operating System
    macOS Sequoia
    Computer type
    PC/Desktop
    Manufacturer/Model
    iMac 24"
    CPU
    M1 3.2 ghz
    Memory
    8gb onboard
    Graphics card(s)
    igpu
    Monitor(s) Displays
    Retina 4.5K
    Screen Resolution
    4480x2520
    Hard Drives
    512gb SSD
No issues with F11 and nothing in the logs related to DNS.
I do not allow Firefox to handle DNS settings as my router (RT-BE86U) can do a better job so everything is off in Firefox.

View attachment 153114
I set that to Off, didn't make any difference. Firefox still crashes when I try to switch to full screen.

Until the official Firefox is fixed, I use the Firefox clone R3DFOX:

 
Last edited:

My Computers My Computers

  • At a glance

    Windows 11 Pro 23H2 (5699), 25H2 (8875)Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz4GBMobile Intel(R) GMA 4500M (Mobile 4 series)
    OS
    Windows 11 Pro 23H2 (5699), 25H2 (8875)
    Computer type
    Laptop
    Manufacturer/Model
    Acer Extensa 5630EZ
    CPU
    Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz
    Motherboard
    Acer Extensa 5630
    Memory
    4GB
    Graphics Card(s)
    Mobile Intel(R) GMA 4500M (Mobile 4 series)
    Sound Card
    Realtek ALC268 @ Intel 82801IB ICH9 - High Definition Audio Controller
    Monitor(s) Displays
    1
    Screen Resolution
    1280x800
    Hard Drives
    Samsung SSD 850 EVO 250GB SATA Device (250 GB, SATA-III)
    Internet Speed
    VDSL 50 Mbps
    Browser
    MICROSOFT EDGE
    Antivirus
    WINDOWS DEFENDER
    Other Info
    Legacy MBR installation, no TPM, no Secure Boot, no WDDM 2.0 graphics drivers, no SSE4.2, cannot get more unsupported ;) This is only my test laptop. I had installed Windows 11 here before upgrading my main PC. For my main PC I use everyday see my 2nd system specs.
  • At a glance

    Windows 11 Pro v25H2 (build 26200.8875)Intel Core-i7 3770 3.40GHz s1155 (3rd generat...2x Kingston Hyper-X Blu 8GB DDR3-1600GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB...
    Operating System
    Windows 11 Pro v25H2 (build 26200.8875)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom-built PC
    CPU
    Intel Core-i7 3770 3.40GHz s1155 (3rd generation)
    Motherboard
    Asus P8H61 s1155 ATX
    Memory
    2x Kingston Hyper-X Blu 8GB DDR3-1600
    Graphics card(s)
    GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB (GV-N3050WF2OCV2-6GD)
    Sound Card
    Realtek HD audio (ALC887)
    Monitor(s) Displays
    Sony Bravia KDL-19L4000 19" LCD TV via VGA
    Screen Resolution
    1440x900 32-bit 60Hz
    Hard Drives
    WD Blue SA510 2.5 1000GB SSD as system disk, Western Digital Caviar Purple 4TB SATA III (WD40PURZ) as second
    PSU
    Thermaltake Litepower RGB 550W Full Wired
    Case
    SUPERCASE MIDI-TOWER
    Cooling
    Deepcool Gamma Archer CPU cooler, 1x 8cm fan at the back
    Keyboard
    Mitsumi 101-key PS/2
    Mouse
    Sunnyline OptiEye PS/2
    Internet Speed
    100Mbps
    Browser
    Microsoft Edge, Mozilla Firefox
    Antivirus
    Microsoft Windows Defender
    Other Info
    Legacy BIOS (MBR) installation, no TPM, no Secure Boot, WDDM 3.0 graphics drivers, WEI score 7.4
Today Firefox updated to 145. Once serious bug is when pressing F11 to go full screen it crashes. Always, every single time. I have read older internet sites suggesting to turn off hardware acceleration. This is not ideal, is there any other solution, or should I wait for the next update?
As you probably know, I run a variety of machines from 15 year old unsupported devices up to systems only a year or so old. I run Firefox on them all, and F11 works perfectly on them all. No problems in 145.0.0 or now in 145.0.1. Whatever your problem is, it's not a widespread one.
 

My Computers My Computers

  • At a glance

    Windows 11 HomeAMD Athlon Silver 3050U8GBRadeon Graphics
    OS
    Windows 11 Home
    Computer type
    Laptop
    Manufacturer/Model
    Acer Aspire 3 A315-23-R9VY
    CPU
    AMD Athlon Silver 3050U
    Memory
    8GB
    Graphics Card(s)
    Radeon Graphics
    Monitor(s) Displays
    laptop screen
    Screen Resolution
    1366x768 native resolution, up to 2560x1440 with Radeon Virtual Super Resolution
    Hard Drives
    1TB Samsung EVO 870 SSD (from April 2026: 250GB EVO 850)
    Internet Speed
    150 Mbps
    Browser
    Edge, Firefox
    Antivirus
    Defender
    Other Info
    UPDATE - 11 April 2026: due to lid hinges starting to break up this laptop has been retired from active duty. The OS with all software and files has been migrated to my System Seven in 'Other systems' to carry on as my general purpose 'main machine'.

    I've now clean installed 25H2 and used Garlin's scripts to update Secure Boot to CA 2023 and revoke the PCA 2011 certificates. It's new role is to test secure boot issues.

    Info for 2021-2026:
    fully 'Windows 11 ready' laptop. Windows 10 C: partition migrated from my old unsupported 'main machine' then upgraded to 11. A test migration ran Insider builds for 2 months. When 11 was released on 5th October 2021 it was re-imaged back to 10 and was offered the upgrade in Windows Update on 20th October. Windows Update offered the 22H2 Feature Update on 20th September 2022. It got the 23H2 Feature Update on 4th November 2023 through Windows Update, 24H2 on 3rd October 2024 through Windows Update by setting the Target Release Version for 24H2, and 25H2 on 30th September 2025 through Windows Update by setting the Target Release Version for 25H2.
  • At a glance

    Windows 11 ProIntel® Core™ i5-520M8GB(integrated graphics) Intel HD Graphics
    Operating System
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Dell Latitude E4310
    CPU
    Intel® Core™ i5-520M
    Motherboard
    0T6M8G
    Memory
    8GB
    Graphics card(s)
    (integrated graphics) Intel HD Graphics
    Screen Resolution
    1366x768
    Hard Drives
    500GB Crucial MX500 SSD
    Browser
    Firefox, Edge
    Antivirus
    Defender
    Other Info
    unsupported machine: Legacy bios, MBR, TPM 1.2, upgraded from W10 to W11 using W10/W11 hybrid install media workaround.

    In-place upgrade to 22H2 using ISO and a workaround.
    Feature Update to 23H2 by manually installing the Enablement Package.
    In-place upgrade to 24H2 using hybrid 23H2/24H2 install media.
    Upgraded to 25H2 by Enablement Package.

    Also running Insider Dev, and Canary builds and Windows 10 as native boot .vhdx.
  • My SYSTEM THREE is a Dell Latitude 5410, i7-10610U, 32GB RAM, 512GB NVMe ssd, supported device running Windows 11 Pro.

    My SYSTEM FOUR was a 2-in-1 convertible Lenovo Yoga 11e (1st gen) type 20DA, Celeron N2930, 8GB RAM, 256GB ssd. Unsupported device. This has now been sold. It has been replaced by my System Eight.

    My SYSTEM FIVE is a Dell Latitude 3190 2-in-1, Pentium Silver N5030, 8GB RAM, 1TB NVMe ssd, supported device running Windows 11 Pro, plus Insider Beta, Dev, and Canary builds (and a few others) as a native boot .vhdx.

    My SYSTEM SIX is a Dell Latitude 5550, Core Ultra 7 165H, 64GB RAM, 1TB NVMe SSD, supported device, Windows 11 Pro 24H2, Hyper-V host machine. Updated to 25H2 on 30th September 2025.

    My SYSTEM SEVEN is a Lenovo Thinkpad T580, Intel Core i7-8650U, 16GB RAM, 512GB NVMe SSD + 2nd 512GB NVMe SSD, a supported device for Windows 11. This is my current general purpose 'main machine'. The installed Windows 11 Home from my System One has been migrated to this machine.

    My SYSTEM EIGHT is a 2-in-1 convertible Lenovo Yoga 11e (5th gen) type 20LN, Celeron N4120, 8GB RAM, 512GB NVMe ssd, a supported device for Windows 11. Currently running Windows 11 Pro, plus Insider Dev, Beta, and Canary builds as native boot vhdx.
I also run a variety of Computers some with the latest Windows 10 and some with the latest Windows 11 with no problem what so ever pressing F11 in Firefox 145.00 or 145.01
 

My Computer My Computer

At a glance

Windows 11 ProIntel Core i9 12900KFCorsair 64GB DDR5 Vengeance C40 5200MhzASUS GeForce RTX 3090 ROG Strix OC 24GB
OS
Windows 11 Pro
Computer type
PC/Desktop
Manufacturer/Model
Custom Build
CPU
Intel Core i9 12900KF
Motherboard
ASUS ROG Maximus Z690 Hero
Memory
Corsair 64GB DDR5 Vengeance C40 5200Mhz
Graphics Card(s)
ASUS GeForce RTX 3090 ROG Strix OC 24GB
Sound Card
OnBoard
Monitor(s) Displays
Acer Predator XB323UGP 32" QHD G-SYNC-C 144Hz 1MS IPS LED
Screen Resolution
2560 x 1440
Hard Drives
1x Samsung 980 Pro Series Gen4 250GB M.2 NVMe
1x Samsung 980 Pro Series Gen4 500GB M.2 NVMe
2x Samsung 980 Pro Series Gen4 2TB M.2 NVMe
PSU
Corsair AX1200i 1200W 80PLUS Titanium Modular
Case
Corsair 4000D Black Case w/ Tempered Glass Side Panel
Cooling
Noctua NH-U12A Chromax Black CPU Cooler, 4x Noctua 120mm Fans
Keyboard
Logitech MK545
Mouse
Logitech MX Master 3
Internet Speed
Fixed Wireless 150mbps/75mbps
Browser
Firefox
Antivirus
Kaspersky
Other Info
Thrustmaster TS-PC RACER
Fanatec CSL Elite Pedals with the Load Cell Kit
Yamaha Amp with Bose Speakers
How can I find out what is the issue and fix it? Would resetting Firefox work? What about my data if I reset? Are they affected? How do I reset Firefox? Thanks.

PS: I even uninstalled Firefox, deleted all relevant folders, just in case, and reinstalled 145.0.1, same thing. Once I try to go full screen it crashes. I will try to remove it again, install 144 and block updates to see if that helps and post back.
 
Last edited:

My Computers My Computers

  • At a glance

    Windows 11 Pro 23H2 (5699), 25H2 (8875)Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz4GBMobile Intel(R) GMA 4500M (Mobile 4 series)
    OS
    Windows 11 Pro 23H2 (5699), 25H2 (8875)
    Computer type
    Laptop
    Manufacturer/Model
    Acer Extensa 5630EZ
    CPU
    Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz
    Motherboard
    Acer Extensa 5630
    Memory
    4GB
    Graphics Card(s)
    Mobile Intel(R) GMA 4500M (Mobile 4 series)
    Sound Card
    Realtek ALC268 @ Intel 82801IB ICH9 - High Definition Audio Controller
    Monitor(s) Displays
    1
    Screen Resolution
    1280x800
    Hard Drives
    Samsung SSD 850 EVO 250GB SATA Device (250 GB, SATA-III)
    Internet Speed
    VDSL 50 Mbps
    Browser
    MICROSOFT EDGE
    Antivirus
    WINDOWS DEFENDER
    Other Info
    Legacy MBR installation, no TPM, no Secure Boot, no WDDM 2.0 graphics drivers, no SSE4.2, cannot get more unsupported ;) This is only my test laptop. I had installed Windows 11 here before upgrading my main PC. For my main PC I use everyday see my 2nd system specs.
  • At a glance

    Windows 11 Pro v25H2 (build 26200.8875)Intel Core-i7 3770 3.40GHz s1155 (3rd generat...2x Kingston Hyper-X Blu 8GB DDR3-1600GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB...
    Operating System
    Windows 11 Pro v25H2 (build 26200.8875)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom-built PC
    CPU
    Intel Core-i7 3770 3.40GHz s1155 (3rd generation)
    Motherboard
    Asus P8H61 s1155 ATX
    Memory
    2x Kingston Hyper-X Blu 8GB DDR3-1600
    Graphics card(s)
    GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB (GV-N3050WF2OCV2-6GD)
    Sound Card
    Realtek HD audio (ALC887)
    Monitor(s) Displays
    Sony Bravia KDL-19L4000 19" LCD TV via VGA
    Screen Resolution
    1440x900 32-bit 60Hz
    Hard Drives
    WD Blue SA510 2.5 1000GB SSD as system disk, Western Digital Caviar Purple 4TB SATA III (WD40PURZ) as second
    PSU
    Thermaltake Litepower RGB 550W Full Wired
    Case
    SUPERCASE MIDI-TOWER
    Cooling
    Deepcool Gamma Archer CPU cooler, 1x 8cm fan at the back
    Keyboard
    Mitsumi 101-key PS/2
    Mouse
    Sunnyline OptiEye PS/2
    Internet Speed
    100Mbps
    Browser
    Microsoft Edge, Mozilla Firefox
    Antivirus
    Microsoft Windows Defender
    Other Info
    Legacy BIOS (MBR) installation, no TPM, no Secure Boot, WDDM 3.0 graphics drivers, WEI score 7.4
Common Causes of Full-Screen Crashes in Firefox

Hardware Acceleration Issues

Enabled Hardware Acceleration: Crashes often occur when hardware acceleration is enabled. Disabling this feature can resolve the issue.

Software Updates

Outdated Software: Ensure that Firefox and your operating system are updated to the latest versions. Updates often include fixes for known issues.

Third-Party Modules

Conflicting Add-ons: Some add-ons or extensions may conflict with Firefox's functionality. Temporarily disabling them can help identify the cause.

Troubleshooting Steps

Basic Fixes


Disable Hardware Acceleration:
Go to Firefox settings.
Under "General," find "Performance" and uncheck "Use recommended performance settings."
Uncheck "Use hardware acceleration when available."

Clear Cache and Cookies:
Go to "Options" > "Privacy & Security" > "Cookies and Site Data" and click "Clear Data."

Advanced Solutions

Test in Troubleshoot Mode:
Start Firefox in Troubleshoot Mode to see if the crash persists. This mode disables add-ons and custom settings.

Check Graphics Drivers:
Ensure your graphics drivers are up-to-date, as outdated drivers can cause display issues.
 

My Computer My Computer

At a glance

Windows 11 ProIntel Core i9 12900KFCorsair 64GB DDR5 Vengeance C40 5200MhzASUS GeForce RTX 3090 ROG Strix OC 24GB
OS
Windows 11 Pro
Computer type
PC/Desktop
Manufacturer/Model
Custom Build
CPU
Intel Core i9 12900KF
Motherboard
ASUS ROG Maximus Z690 Hero
Memory
Corsair 64GB DDR5 Vengeance C40 5200Mhz
Graphics Card(s)
ASUS GeForce RTX 3090 ROG Strix OC 24GB
Sound Card
OnBoard
Monitor(s) Displays
Acer Predator XB323UGP 32" QHD G-SYNC-C 144Hz 1MS IPS LED
Screen Resolution
2560 x 1440
Hard Drives
1x Samsung 980 Pro Series Gen4 250GB M.2 NVMe
1x Samsung 980 Pro Series Gen4 500GB M.2 NVMe
2x Samsung 980 Pro Series Gen4 2TB M.2 NVMe
PSU
Corsair AX1200i 1200W 80PLUS Titanium Modular
Case
Corsair 4000D Black Case w/ Tempered Glass Side Panel
Cooling
Noctua NH-U12A Chromax Black CPU Cooler, 4x Noctua 120mm Fans
Keyboard
Logitech MK545
Mouse
Logitech MX Master 3
Internet Speed
Fixed Wireless 150mbps/75mbps
Browser
Firefox
Antivirus
Kaspersky
Other Info
Thrustmaster TS-PC RACER
Fanatec CSL Elite Pedals with the Load Cell Kit
Yamaha Amp with Bose Speakers
Like I said, it was a bug in Firefox 145 and 145.0.1 I uninstalled it completely, deleted all Mozilla folders from my PC, just in case, reinstalled Firefox 144.0.2, set updates to notify me and not install automatically. Bingo! I can toggle from full screen to window as many times as I like, version 144.0.2 NEVER crashes. So it wasn't a graphics drivers or whatever else issue. I insist It was a Firefox 145 or later bug which must be fixed. Obviously they changed something that causes the issue. Just because I have the issue but you are not affected doesn't mean there is no issue. Yes, it is, but obviously it doesn't affect everyone. Not all bugs affect everyone. Trying to prove me wrong isn't helping and it is rather annoying, please refrain. Please developers if you read this, UNDO any changes you did in 145 or later! Thanks.
 
Last edited:

My Computers My Computers

  • At a glance

    Windows 11 Pro 23H2 (5699), 25H2 (8875)Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz4GBMobile Intel(R) GMA 4500M (Mobile 4 series)
    OS
    Windows 11 Pro 23H2 (5699), 25H2 (8875)
    Computer type
    Laptop
    Manufacturer/Model
    Acer Extensa 5630EZ
    CPU
    Mobile DualCore Intel Core 2 Duo T7250, 2000 MHz
    Motherboard
    Acer Extensa 5630
    Memory
    4GB
    Graphics Card(s)
    Mobile Intel(R) GMA 4500M (Mobile 4 series)
    Sound Card
    Realtek ALC268 @ Intel 82801IB ICH9 - High Definition Audio Controller
    Monitor(s) Displays
    1
    Screen Resolution
    1280x800
    Hard Drives
    Samsung SSD 850 EVO 250GB SATA Device (250 GB, SATA-III)
    Internet Speed
    VDSL 50 Mbps
    Browser
    MICROSOFT EDGE
    Antivirus
    WINDOWS DEFENDER
    Other Info
    Legacy MBR installation, no TPM, no Secure Boot, no WDDM 2.0 graphics drivers, no SSE4.2, cannot get more unsupported ;) This is only my test laptop. I had installed Windows 11 here before upgrading my main PC. For my main PC I use everyday see my 2nd system specs.
  • At a glance

    Windows 11 Pro v25H2 (build 26200.8875)Intel Core-i7 3770 3.40GHz s1155 (3rd generat...2x Kingston Hyper-X Blu 8GB DDR3-1600GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB...
    Operating System
    Windows 11 Pro v25H2 (build 26200.8875)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom-built PC
    CPU
    Intel Core-i7 3770 3.40GHz s1155 (3rd generation)
    Motherboard
    Asus P8H61 s1155 ATX
    Memory
    2x Kingston Hyper-X Blu 8GB DDR3-1600
    Graphics card(s)
    GIGABYTE GeForce RTX 3050 WINDFORCE OC V2 6GB (GV-N3050WF2OCV2-6GD)
    Sound Card
    Realtek HD audio (ALC887)
    Monitor(s) Displays
    Sony Bravia KDL-19L4000 19" LCD TV via VGA
    Screen Resolution
    1440x900 32-bit 60Hz
    Hard Drives
    WD Blue SA510 2.5 1000GB SSD as system disk, Western Digital Caviar Purple 4TB SATA III (WD40PURZ) as second
    PSU
    Thermaltake Litepower RGB 550W Full Wired
    Case
    SUPERCASE MIDI-TOWER
    Cooling
    Deepcool Gamma Archer CPU cooler, 1x 8cm fan at the back
    Keyboard
    Mitsumi 101-key PS/2
    Mouse
    Sunnyline OptiEye PS/2
    Internet Speed
    100Mbps
    Browser
    Microsoft Edge, Mozilla Firefox
    Antivirus
    Microsoft Windows Defender
    Other Info
    Legacy BIOS (MBR) installation, no TPM, no Secure Boot, WDDM 3.0 graphics drivers, WEI score 7.4
Like I said, it was a bug in Firefox 145 and 145.0.1 I uninstalled it completely, deleted all Mozilla folders from my PC, just in case, reinstalled Firefox 144.0.2, set updates to notify me and not install automatically. Bingo! I can toggle from full screen to window as many times as I like, version 144.0.2 NEVER crashes. So it wasn't a graphics drivers or whatever else issue. I insist It was a Firefox 145 or later bug which must be fixed. Obviously they changed something that causes the issue. Just because I have the issue but you are not affected doesn't mean there is no issue. Yes, it is, but obviously it doesn't affect everyone. Not all bugs affect everyone. Trying to prove me wrong isn't helping and it is rather annoying, please refrain. Please developers if you read this, UNDO any changes you did in 145 or later! Thanks.
We are here to help people out and yes some people have issues and others don't as every computer/notebook are different with hardware, windows versions and a variety of installed programs which can effect a specific program. Our suggestions were just options for you to try to help you fix your issue.
 

My Computer My Computer

At a glance

Windows 11 ProIntel Core i9 12900KFCorsair 64GB DDR5 Vengeance C40 5200MhzASUS GeForce RTX 3090 ROG Strix OC 24GB
OS
Windows 11 Pro
Computer type
PC/Desktop
Manufacturer/Model
Custom Build
CPU
Intel Core i9 12900KF
Motherboard
ASUS ROG Maximus Z690 Hero
Memory
Corsair 64GB DDR5 Vengeance C40 5200Mhz
Graphics Card(s)
ASUS GeForce RTX 3090 ROG Strix OC 24GB
Sound Card
OnBoard
Monitor(s) Displays
Acer Predator XB323UGP 32" QHD G-SYNC-C 144Hz 1MS IPS LED
Screen Resolution
2560 x 1440
Hard Drives
1x Samsung 980 Pro Series Gen4 250GB M.2 NVMe
1x Samsung 980 Pro Series Gen4 500GB M.2 NVMe
2x Samsung 980 Pro Series Gen4 2TB M.2 NVMe
PSU
Corsair AX1200i 1200W 80PLUS Titanium Modular
Case
Corsair 4000D Black Case w/ Tempered Glass Side Panel
Cooling
Noctua NH-U12A Chromax Black CPU Cooler, 4x Noctua 120mm Fans
Keyboard
Logitech MK545
Mouse
Logitech MX Master 3
Internet Speed
Fixed Wireless 150mbps/75mbps
Browser
Firefox
Antivirus
Kaspersky
Other Info
Thrustmaster TS-PC RACER
Fanatec CSL Elite Pedals with the Load Cell Kit
Yamaha Amp with Bose Speakers

My Computer My Computer

At a glance

Windows 11 ProIntel Core i9 12900KFCorsair 64GB DDR5 Vengeance C40 5200MhzASUS GeForce RTX 3090 ROG Strix OC 24GB
OS
Windows 11 Pro
Computer type
PC/Desktop
Manufacturer/Model
Custom Build
CPU
Intel Core i9 12900KF
Motherboard
ASUS ROG Maximus Z690 Hero
Memory
Corsair 64GB DDR5 Vengeance C40 5200Mhz
Graphics Card(s)
ASUS GeForce RTX 3090 ROG Strix OC 24GB
Sound Card
OnBoard
Monitor(s) Displays
Acer Predator XB323UGP 32" QHD G-SYNC-C 144Hz 1MS IPS LED
Screen Resolution
2560 x 1440
Hard Drives
1x Samsung 980 Pro Series Gen4 250GB M.2 NVMe
1x Samsung 980 Pro Series Gen4 500GB M.2 NVMe
2x Samsung 980 Pro Series Gen4 2TB M.2 NVMe
PSU
Corsair AX1200i 1200W 80PLUS Titanium Modular
Case
Corsair 4000D Black Case w/ Tempered Glass Side Panel
Cooling
Noctua NH-U12A Chromax Black CPU Cooler, 4x Noctua 120mm Fans
Keyboard
Logitech MK545
Mouse
Logitech MX Master 3
Internet Speed
Fixed Wireless 150mbps/75mbps
Browser
Firefox
Antivirus
Kaspersky
Other Info
Thrustmaster TS-PC RACER
Fanatec CSL Elite Pedals with the Load Cell Kit
Yamaha Amp with Bose Speakers

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