What can Firefox provide with PIP mode supported from Android framework O? * Video playback in PIP mode? * Float browsing in PIP mode on tablet?
There is also an ongoing Web API standardization effort  which IMHO should be taken into consideration too. BTW, looks like Chrome already has it for Android O .  https://github.com/WICG/picture-in-picture  https://developers.google.com/web/updates/2017/09/picture-in-picture
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