Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
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I'm not sure what the "FE button" is. Here are full screenshots of the dialog in Edge and Firefox. I can also trigger the dialog with some websites' share buttons in Chrome, but I can't find a dedicated share function as part of the browser.

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will that disable the context menu entry too? (i have edge disabled so cant test atm)In Edge, you can just remove the Share button on the toolbar.
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Add or Remove Buttons on Toolbar in Microsoft Edge
This tutorial will show you how to add or remove buttons on the toolbar in Microsoft Edge for your account in Windows 10 and Windows 11. The Microsoft Edge web browser is based on Chromium and was released on January 15, 2020. It is compatible with all supported versions of Windows, and macOS...www.elevenforum.com
will that disable the context menu entry too? (i have edge disabled so cant test atm)

www.elevenforum.com