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Why won't videos play in Firefox?

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Videos in YouTube and news sites will not play. Everything worked last night. This afternoon no videos play. I tried updating Real Player plug-ins, re-installing Real Player, installing QuickTime, checking QuickTime plug-ins, etc. Nothing works.

Videos in YouTube and news sites will not play. Everything worked last night. This afternoon no videos play. I tried updating Real Player plug-ins, re-installing Real Player, installing QuickTime, checking QuickTime plug-ins, etc. Nothing works.

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I Uninstall Realplayer and it works now. Realplayer was blocklisted by Flash.

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I Uninstall Realplayer and it works now. Realplayer was blocklisted by Flash.

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That worked. Thanks for your help!