Android compatibility

[rugk]

Background

Since recently Firefox for Android has open add-on compatibility, i.e. all users can download (web) extensions for Firefox for Android, also in the stable version.

I've marked v2.2 as compatible for testing, but in my testing it did not really work.

Proposed solution

Find the issues (web-ext auto-check on AMO did not find anything interesting only manifest v3 thingy issues) and make it compatible.

See https://extensionworkshop.com/documentation/develop/developing-extensions-for-firefox-for-android/#install-and-run-your-extension-in-firefox-for-android for help.

Alternatives

none

(For now we could mark it as non-compatible again.)

Additional context