why does FireFox not display Captcha's sometimes

Sometimes when I try to subscribe or login into a website, i get a "capthcha failed" message. The same subscription or login works with EDGE, but I strongly prefer Firefox.\\
Firefox 138.0.3

Use "User Agents" :

But with the help of extension (User-Agent Switcher and Manager – Get this Extension for Firefox (en-US))
and not to about:config.

Use VPN

Disable AdBlock on this site.

In some cases, nothing can help