Make extension available in Firefox for Android

### Describe the feature you'd like to request

Firefox is now allowing all extensions marked as "Android compatible" on mobile.
This would mean having Floccus directly in the browser like the desktop versions currently.

### Describe the solution you'd like

[Mozilla news piece about extension support on Android](https://blog.mozilla.org/addons/2023/11/28/open-extensions-on-firefox-for-android-debut-december-14-but-you-can-get-a-sneak-peek-today/)

[Porting guide](https://extensionworkshop.com/documentation/develop/developing-extensions-for-firefox-for-android/)

### Describe alternatives you've considered

The current application works fine, though I often forget to use it and it is slightly less convenient.