Context menu "Page Speed" in video playback

In clarification to answer given to https://support.mozilla.org/en-US/questions/961774#answer-463032 (closed thread): The context menu "Page Speed" in video playback applies to a html5 video playback streams. Older flashplayer video does not support this feature. This is not related to tab mix plus addon.
(this is comment rather than question)

See answer above
Check http://www.youtube.com/html5 that it is enabled if applicable. Html5 player test videos can be found at http://www.quirksmode.org/html5/tests/video.html if you are not sure where to find a video that will show the "play speed" context menu. If you believe that a html5 video stream is available for the web page but are still seeing the flashplayer video you need to temporarily disable flash support before loading the web page. For that, you may like to try the quickjava addon , which gives you a button to turn flash on/off while browser is running. If you don't see any video after disabling flash then that page does not support an alternate html5 player stream.

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Do you mean by a strobe effect that the brightness of the footage is changing randomly?
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More information needed for someone to help... click these links and provide the requested information
-http://forums.adobe.com/message/4200840
-http://forums.adobe.com/thread/416679
-http://forums.adobe.com/thread/419406
Read Bill Hunt on a file type as WRAPPER http://forums.adobe.com/thread/440037
What is a CODEC... a Primer http://forums.adobe.com/thread/546811
What CODEC is INSIDE that file? http://forums.adobe.com/thread/440037
Report back with the codec details of your file, use the programs below... a screen shot works well to SHOW people what you are doing
http://forums.adobe.com/thread/592070?tstart=30
For PC http://mediainfo.sourceforge.net/en or http://www.headbands.com/gspot/
http://blogs.adobe.com/premiereprotraining/2011/02/red-yellow-and-green-render-bars.html
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*http://kb.mozillazine.org/userChrome.css
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MacBook Pro 2009
OS X 10.7.4
Pages 09 4.2 from Apple App Store
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Video playback speed in After Effects

           After importing QuickTime video into After Effects it plays back at about half (or even slower) the initial frame rate (13 fps or so instead of 29.97 fps). Also in the top right corner of the workspace (Info Panel) I'm getting a message that "...Layer 1 Retrieving Frame".
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Eiss wrote:
          Sure, After Effects isn't a movie player. But it is possible to edit source footage in AE in order to make a coherent whole out of it, isn't it?
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Context menu "Page Speed" in video playback

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