Flash still won't play files in Firefox 4, even with latest version 10

Despite what a Firefox support article states, Adobe Flash will not play videos in Firefox 4, even after Flash has been upgraded to the most recent version of Flash 10 (10.3.181.14). That is because the problem is not with Flash, it is in fact a problem with Firefox 4 (what a surprise!). After trying all the useless suggestions here, I finally just went back to Firefox 3.16. Flash had always worked for me prior to switching to Firefox 4. Sure enough, no sooner did I go back to 3.16, Flash immediately began playing videos properly again. Same latest version of Flash, old version of Firefox equal proper video operation. Any version of Flash, Firefox 4 equals no videos play.

I've upgraded from flash 10.0.45 to 11.2.202.235, using Synaptic.
Then, when i saw it didn't work, i've returned to 10.0.45 and upgraded it to 11.2.202.233, no success.
There is an screenshot from a Youtube page, as you can see the video doesn't work, even if i wait a few minutes...
Screenshot from a Dailymotion page,

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See Here > Download Past Purchases > http://support.apple.com/kb/HT2519
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Flash still won't play files in Firefox 4, even with latest version 10

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