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Flash plugin will not install since upgrading Firefox

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Since upgrading to the latest version of Firefox, my Flash plug-in no longer works and after repeated attempts to download and install (both the manual Flash installer, and by visiting pages like Youtube which prompt installation) nothing is working. It's a frustrating loop that gets me nowhere and I've spent hours now uninstalling Flash, uninstalling Firefox, reading through forums etc. and I am getting no help aside from some suggestions to just give up and use Chrome, which is working with Flash just as well as it ever did. I can't understand why it seems like many people are facing this issue, yet there is no apparent fix to be found.

Since upgrading to the latest version of Firefox, my Flash plug-in no longer works and after repeated attempts to download and install (both the manual Flash installer, and by visiting pages like Youtube which prompt installation) nothing is working. It's a frustrating loop that gets me nowhere and I've spent hours now uninstalling Flash, uninstalling Firefox, reading through forums etc. and I am getting no help aside from some suggestions to just give up and use Chrome, which is working with Flash just as well as it ever did. I can't understand why it seems like many people are facing this issue, yet there is no apparent fix to be found.

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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.

  • On Vista and Windows 7 you may need to run the plugin installer as Administrator by starting the installer via the right-click context menu if you do not get an UAC prompt to ask for permission to continue (i.e nothing seems to happen).

See this:
http://vistasupport.mvps.org/run_as_administrator.htm