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can't play you tube asks 2 install adobe flash i do so and still does not play

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After years of watching you tube videos Mozilla has decided it cannot play same without Adobe Flash Player. I click to download. It takes me to download and then says i have to close conflicting Mozilla to download. I do and run it and then go back to Mozilla and still cannot play you tube videos. Internet Explorer, which I hate to use plays you tube fine and I have always had the Flash Player in the PC. I uninstalled Mozilla and re-installed and still the same problem. Any suggestions???????????????

After years of watching you tube videos Mozilla has decided it cannot play same without Adobe Flash Player. I click to download. It takes me to download and then says i have to close conflicting Mozilla to download. I do and run it and then go back to Mozilla and still cannot play you tube videos. Internet Explorer, which I hate to use plays you tube fine and I have always had the Flash Player in the PC. I uninstalled Mozilla and re-installed and still the same problem. Any suggestions???????????????

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1.Download the Flash setup file from here:
Adobe Flash - Plugin version.
Save it to your Desktop.

2. Close Firefox using File > Exit
then check the Task Manager > Processes tab to make sure firefox.exe is closed,
{XP: Ctrl+Alt+Del, Vista: Shift+Ctrl+ESC = Processes tab}

3. Then run the Flash setup file from your Desktop.