Reproducible with: - Firefox 36 Beta 5 - BuildID: 20150129200438 Reproducible on: Windows XP x86 NOT reproducible on: Windows XP x64, Vista x86, Vista x64 Steps to reproduce: 1. Open Firefox with a clean profile and go to any youtube video (e.g. https://www.youtube.com/watch?v=c86t8hoVw8E). 2. Open the task manager to see how much CPU Firefox takes (5-10% in my case). 3. Try the following actions while video is playing: a) Right click outside of the video area to bring up the context menu b) Open "Stats for nerds" and hover the "x" button c) Hover video overlays d) bring another window to the foreground Expected results: Actions from step #3 do not affect the video frame rate or CPU usage. Actual results: All actions from step #3 cause a very visible drop in frame rate and CPU usage climbs to around 35% each time. Dismissing the actions from step #3 causes the frame rate and CPU usage to recover. See http://www.screencast.com/t/z6oG4AnGNqB. Notes: - Windows XP x86 seems to be the only one affected. Any other Windows version (tried XP and Vista for now) on the same machine works fine in this scenario - Video card is: AMD Radeon HD 3000 - in order to check this on Vista, I've set "media.mediasource.enabled"=false - the issue is not much unlike what I see with Firefox 35.0.1 on the same machine with XP x86. This uses Flash, but I get the same loss in frame rate and high CPU usage when performing actions from step #3.
Component: Audio/Video → Audio/Video: Playback
XP -> Flash issue
Component: Audio/Video: Playback → Plug-ins
Resolving old bugs which are likely not relevant any more, since NPAPI plugins are deprecated.
Status: NEW → RESOLVED
Last Resolved: 2 years ago
Resolution: --- → INCOMPLETE
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