Maybe i didn't understand very good but stock browser support flash player? Without it you can watch? Because with habbit browser i have the same problem but as i said with dolphin it is ok
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I installed stock browser that was coming with liquid (probably is the same) and m.youtube is working without full screen. The file you need is libwebviewchromium.so.
that file i had included too... of course .. + other related files to Chromium .. but no difference..
and now i've replaced only the file libweviewchromium.so and the other replaced files before again replaced with the older one .. (from 18/11) .. and now i can see the advertsiment Video ... without fullscreen.. but the real video don't play.. also not on fullscreen ... (m.youtube)
Right now tested vevo .. and i can see the video in normal mode .. (no fullscreen .. but works!)
btw: check on vevo .. then music .. and see the Video: Katy Perry - Dark Horse ... AMAZING HD Quality !!
I hope it's right now... i'll make a release with the fix .. (the one file)
EDIT: I can watch live video on every site .. only m.youtube.com don't work.. but no matter... we can use OG YT App .. then 720p is available ^^
INFO: tested on: clipfish, vevo, twich, myvideo ...