Is the Shockwave Flash plugin still installed after a reboot if you check that?

You can find the Flash plugin file (NPSWF32_##_X_XXX_XXX.dll) in this folder:

• 32 bit Windows: C:\Windows\System32\Macromed\Flash\
• 64 bit Windows: C:\Windows\SysWOW64\Macromed\Flash\

If the plugin is still there then there might be a problem with the Windows Registry or with the pluginreg.dat file in the Firefox profile folder.

• https://developer.mozilla.org/Add-ons/Plugins/Gecko_Plugin_API_Reference/Plug-in_Basics#How_Gecko_Finds_Plug-ins

Try to delete the pluginreg.dat file in the Firefox Profile Folder and maybe addons.sqlite as well to reset the plugin registry databases.

See Re-initializing the plugins database:

• https://support.mozilla.org/kb/troubleshoot-issues-with-plugins-fix-problems

You can use this button to go to the current Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox

I did all that, the computer does have flash installed because I can use chrome and explorer to view the same page that firefox has problems with just fine. I deleted the plugin.dat file and resetted the windows 7 registry and still have the same problem.

Both Google Chrome and IE use their own version of the Shockwave Flash plugin and not the NPAPI version that Firefox uses.

I figured it out after hours of effort on weekends when I'm free. I tried everything firefox suggested and even adobe. Doing total complete uninstalls, disabling addons and a lot of restarts. It turns out that Adobe and firefox has a history of putting out new versions that are not compatible with each other. I removed firefox and reinstalled an older version of when the problem started back in January and it was fixed. There was never a problem with chrome and explorer just firefox, refusing to display videos. But can youtube can still work.