User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0
Steps to reproduce:
Play video on Youtube or Periscope.
Youtube and Periscope video playback performance is very bad. Dropped frames. Freezes and audio drop outs, along with very slow page elements like comments and animations when video is playing.
I can play all video normally using other software. For example using VLC to play a video from Youtube is perfect. Smooth video, no dropped frames or audio drop out. Video playback is also much better in Google Chrome Browser on Periscope or Youtube.
I have tried running FF in safe mode which makes no difference.
I have checked the about: page and my GPU is shown as visible and enabled.
I should repeat that even though this laptop (Lenova 110s) is not a massively high performance model, I can play video normally in VLC and Google Chrome, so this is not a problem with device hardware performance.
I also tried enabling AzureCanvasAccelerated but it would not turn on.