I confirm this addon works in Firefox for Android 68.11, Android 12. But this add-on is not in the very limited add-on list of Firefox for Android, So it must first be downloaded using computer ("request desktop site" may work also), open the downloaded xpi file with Firefox for Android 68.11, then select "allow" in popup dialogue. No convoluted process of nightly version needed. Version 68.11 seems the last that could install add-ons and set about:config, so do not update!

Just needed to download Windows ISO, rather than Media Creation Tool. Worked like a charm.

It's a great and easy to use add-on, but it's presets are very old and out dated at this point in time.

good

Does what it says, but this only works for "dumb" browser checks

Could use some improvements, like a panel where you check all overriden domains (as if you override imgur.com it will always redirect to imgur.io, making it impossible to undo without disabling the extension) and a "simple mode" that allows switching only between desktop and android UA.

By changing your user agent to Windows / Edge, Microsoft Teams works like a charm on Linux :)

Worked perfect for me.

Practical, especially if you want to upload something from your PC to Instagram. Even now, when I want to use Teams in the browser, I can do so despite Microsoft's disabling, because I pretend to be on Edge. I noticed that the Chromium-based Edge is still missing and only the old one is available.