Comment 16 for bug 1930982

Jamie, I can confirm it happens on other sites, it also happens regardless of the codec as far as I can tell - normally I have everything but avc1/h264 disabled on the device in about:config just due to it being kinder on battery life, but I re-enabled vp9 (and ensured that youtube, in this case, was serving vp9) and it has the same issue. Please let me know if there's anything else you'd like me to check.