Firefox wont open or play all the videos ... in other web browsers it works just fine

Tried refreshing, deleting temporary files, offline files, cookies ... even tried reinstalling Firefox 4.0 beta 8 to Firefox 4.0 beta 10 ... then tried to update all the plugins - shockwave, java, flash, widows media plugin, realplayer plugin ... adobe reader also and the problem still remains

You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History > Show All History" or "View > Sidebar > History") or via the about:permissions page.
Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks, cookies, passwords, cache, history, and exceptions, so be cautious and if you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note.
You can't recover from this 'forget' unless you have a backup of the involved files.
It doesn't have any lasting effect, so if you revisit such a 'forgotten' website then data from that website will be saved once again.
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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Thank you Carolyn Samit.
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http://support.apple.com/kb/PH12359
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http://support.apple.com/kb/ht1933
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Firefox wont open or play all the videos ... in other web browsers it works just fine

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