Firefox 11.0 doesn't remember youtube player size

When I restart firefox and open yt video, the player is always of the small size 360p. It just doesn't remember the player size. It was OK on firefox 10.0.2, so I reverted to that version, and it's working again, remembering the size. The same thing was happening few versions back. When I updated to FF 8.0 (from 7.0) it stopped remembering the size, but then it was fixed in later version, I don't remember which exactly, 9.0 or 10.0. So it was OK for some time, and now again exactly the same thing with 11.0. What's going on with FF? And can I fix it somehow? Because right now I'm stuck to 10.0, cause I'm tired clicking the large player button every time I restart my browser.

After restarting Firefox please check if the YouTube cookie is still present in '''Tools '''('''Alt '''+ '''T''') > '''Options '''> '''Privacy '''> '''Remove individual cookies''' or in '''Show Cookies'''. If the cookie is not present there could be another application or perhaps its extension/plugin (Tools > Add-ons > Extensions, Plugins) deleting Firefox data as it is closed.

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[YouTube XL no longer supported|https://support.google.com/youtube/answer/3123170?hl=en]
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Firefox 11.0 doesn't remember youtube player size

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