cannot play youtube videos full screen mode in Intrepid

[H.S.]

Hello,

If I try to play youtube videos in full screen mode in Intrepid, the
videos shows in full screen mode for an instant and then reverts back to
the usual web page mode. I do appear to be able to make it play in full
screen mode at all. Anybody else having this problem? I have:
ii  flashplayer-mozilla  1:10.0.12.36-0.2  Macromedia Flash Player
ii  mozilla-firefox-adblock  0.5.3.043-5  AdBlock extension for the
Iceweasel and Icea


Thanks.
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