[Feature] Mark Firefox extension as compatible on Android

[Burkino]

Describe the solution you'd like
When uploading a new version of the extension for Firefox simply check "Firefox for Android"

Describe alternatives you've considered
On desktop download the signed .xpi from Mozilla, transfer it over to your phone, enable developer options on Firefox for Android (About me > tap the Firefox icon a lot of times), click on "Install extension from file" and install the .xpi

Additional context
I did a bit of testing, it's about the kind of experience I would expect on mobile. The player loads, it replaces the video element, it plays the video.