when a site has a youtube video i can not watch it in full screen in others browser i can i see the full screen icon but not in firefox
Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache.
The Firefox cache temporarily stores images, scripts, and other parts of websites while you are browsing.
Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies, do the following:
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flash has nothing to do look at this http://www.youtube.com/html5 HTML5 is a new browser technology that allows us to show videos without the Flash plug-in. Notes
Fullscreen support is partially implemented. Pressing the fullscreen button will expand the player to fill your browser. If your browser supports a fullscreen option, you can then use that to truly fill the screen.
so firefox does not have the full screen icon
dolphin and boat browsers have
Assuming YouTube has not overridden Firefox's default. Long pressing on the video will bring up a menu with several options including Fullscreen.