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youtube.com doesn't work properly with Google Fiber

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Youtube.com does not play "HD" formats such as 480p, 720p, and 1080p when I use Firefox and Google Fiber together. When I use other browsing systems such as Chrome or Safari I have no problem playing hd videos on youtube in conjunction with Google Fiber. As soon as I go to change the resolution for the video playback (to an hd format) it just stops. the play screen turns black, stops loading, and I cant do anything with the video unless I refresh the page. but then I can only play it in standard definition like it was try to do in the first place. There are no error messages. This happens with any hd videos that I try. I have contacted and received help from google fiber but they recomended I come here.

Youtube.com does not play "HD" formats such as 480p, 720p, and 1080p when I use Firefox and Google Fiber together. When I use other browsing systems such as Chrome or Safari I have no problem playing hd videos on youtube in conjunction with Google Fiber. As soon as I go to change the resolution for the video playback (to an hd format) it just stops. the play screen turns black, stops loading, and I cant do anything with the video unless I refresh the page. but then I can only play it in standard definition like it was try to do in the first place. There are no error messages. This happens with any hd videos that I try. I have contacted and received help from google fiber but they recomended I come here.

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That's really strange.

This is some standard guidance that addresses the most common issues with the Flash Player plugin. I'm sure you've seen some of it before, but just in case:

(1) If you have any recorders/downloaders that interact with Flash media make sure they are as up-to-date as possible, or disable them temporarily.

(2) Disable hardware graphics acceleration in Firefox and in Flash

(A) In Firefox, un-check the box here and restart:

orange Firefox button (or Tools menu) > Options > Advanced > General > "Use hardware acceleration when available"

(B) In Flash, see this support article from Adobe: http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues

(3) Disable protected mode (Windows Vista and higher)

The following pages provide different ways to do that: