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HELP! Firefox 3.6.11 won't play flash viseo, etc from Youtube.

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mexicomemo
mexicomemo
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Have spent 5+ hrs on this and am ready to give up! Youtube streaming videos won't play on Firefox 3.6.11 - get message "plugin has been blocked for your protection". Have updated all plugins & players, etc. On I.E. all plays fine.? Am using IE more often today, which I don't want to do. On Firefox at other streaming sites I get jagged video & play???

Have spent 5+ hrs on this and am ready to give up! Youtube streaming videos won't play on Firefox 3.6.11 - get message "plugin has been blocked for your protection". Have updated all plugins & players, etc. On I.E. all plays fine.? Am using IE more often today, which I don't want to do. On Firefox at other streaming sites I get jagged video & play???

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cor-el
cor-el
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the Safe mode start window to disable all extensions.
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")