Fixes for Firefox for Android:
- Subtitles now keep a normal size even when the phone uses a larger system font.
- The dubly.me button on the video now opens the settings in a new tab, and goes back to the video when you are done.

Better experience on Firefox for Android:
- Dubbing now starts on mobile YouTube (m.youtube.com) even before the video has started playing.
- Subtitles scale to the size of the video player.
- Dub volume now follows the video player's own volume.
- New settings button next to the dub button. Both are shown as floating buttons, one above the other.
- The popup now fits the phone screen.