Firefox slow on the Site of HTML5

I don't understand why when I try and watch a HTML5 website in Firefox, Firefox slows down to a crawl.

I tried all the latest versions including Beta.

I'll get something related bugzilla and if I find anything I'll create a minimal example based on your template and submit it (if you don't mind).

Tags: Firefox

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    If this is not the case, try to create a fresh Firefox profile. It will be the Flash plugin, which is the control of sites use usually to connects to your camera or microphone and other plugins, but otherwise will be a new configuration. This article has the commissioning steps in the Profile Manager: use the Profile Manager to create and delete profiles Firefox.

    If the sites are functioning normally in the new profile, you can import your bookmarks from your old profile, as well as the copy on the other files that do not appear to be the cause of the problem. Some trial and error may be needed to determine that. This article has a few tips: recovery of data from an old profile.

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    Any improvement?

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