Firefox crashes as soon as Flash video tries to load and Safari shows the error "Plug-in Failure"

I am unable to use Youtube or view Flash video on any sites.
Firefox crashes/quits as soon as a video tries to load and Safari shows the error "Plug-in Failure".
I have uninstalled Flash, downloaded a fresh version and installed, but no joy.
I am using OS X 10.6.6.
This is what I have tried so far;
1. Repaired Permissions.
2. Restarted with external drive and run Disk repair.
3. Restarted with external drive and run DiskWarrior.
4. Completely uninstalled Flash plugin. Robooted. Reinstalled Flash plugin. Rebooted.
5. I even installed an earlier version of the plugin to see if there was some incompatibility with the latest version.
6. Created a new user login and tried from there. Same problem.
Any ideas?

You have what is necessary for Flash Player to be working. Firefox had some issues last year but it was after loading a video or the website. I had not heard of it lately and even last year don't recall it happening on the Macs.
What is happening with yours sounds like a direct conflict with some addon/extension.
Here is the link from Firefox describing what happened last year. You might want to see if there is anything more current.
https://support.mozilla.com/en-US/kb/The%20Adobe%20Flash%20plugin%20has%20crashed?s=Firefo x+crashing+browser&as=s
I'll get the Mac troubleshooting guide in a minute and post it also.
Any adblock or popup blocker software would cause this also.
Thanks,
eidnolb

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See:
* https://support.mozilla.com/kb/Managing+the+Flash+plugin
* https://support.mozilla.com/kb/Installing+the+Flash+plugin
* http://kb.mozillazine.org/Flash
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* http://get.adobe.com/flashplayer/
* http://get.adobe.com/flashplayer/otherversions/
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* http://www.adobe.com/software/flash/about/

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The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
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Did this fix your problems? Please report back to us!
If that did not work, please give us crash report IDs so we can see what might have caused the problem. ''Remember: you should have first send Mozilla crash report information that we can check on databases before sending us any ID''
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