Proper support for horizontal orientation on Android

[vadya]

Currently on Android phones as soon as you rotate your phone to horizontal the space around selfie camera turns black and stays like this even if you watch videos in fullscreen. As far as I know it can be fixed, because Chrome does work properly in such a scenario using the whole screen real estate. This is especially annoying on foldable devices which are almost square shaped when unfolded, but Firefox doesn't work properly for horizontal orientation.

[Jon]

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