Enhance Firefox compatibilty

[cyyynthia]

While the core of the extension is working, some extra attention needs to be given to Firefox support, to FF users a better experience:

• Properly adapt to Firefox' minimum sizing for extensions which have been threw out of the toolbar
• Test & publish the extension for Firefox for Android

[cyyynthia]

Now that the extension is being e2e tested using Playwright, testing support for Firefox on Mobile will be easier (and continuously tested whenever I get around setting up GitHub Actions).

Playwright documentation for Android: https://playwright.dev/docs/api/class-android

[win8linux]

Is there anything else needed for Android support?

[cyyynthia]

Well, running the extension on Firefox for Android is completely untested and I'm unsure it'd work right. The tests I've setup a while ago never were that great and are now mostly broken, I might just remove them to be honest.

I'm unsure how to proceed to make sure it works right, do the changes, and maintain support :/