FF73 somehow screwed my YouTube double tap to fullscreen functionality (desktop vs tabled behaviour shenanigans)
I have a problem with FF73 on my Windows 8 tablet. So in FF72 and all previous versions double tapping on YouTube videos switched between fullscreen and windowed modes of said videos, yet with FF73 for some reason double tapping now does fast forward/fast backwards 10 seconds actions depending on where I tap on the screen, which is something I understand is an expected behaviour on Android and other mobile oriented operating systems. I hate it and want double tap to go to it's old functionality. Going back to FF72 does fix the problem, so the problem is not on YouTube's end. Also going back to the previous version of FF creates a whole set of annoying problems, so it's obviously not optimal. I wonder if there is some hidden config setting introduced in FF73 that tells YouTube I'm on a tablet specifically, which was not previously shared? Any ideas?
I'm trying to see if this is maybe the intended behavior to begin with as you're using a tablet and it was "Fixed" in 73 versus the older versions where it was "behaving incorrectly" (which is what you preferred, not that that's bad or anything) but from a dev standpoint.
I'm looking into it.
Determination on our end is that you're potentially seeing Youtube A/B testing and they changed it on their end (your 72 version might be slotted in an A test versus your 73 which is in a B test) as we cannot replicate full screen double tap on 72, 73, 74, or 75 on our tablets. So this is likely a youtube issue, unfortunately :(
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