Flash Player 9.x and 10.x crashes Mozilla Firefox 5.x and 6.x

I'm running Windows 7 64-bit with 8GB of RAM and plenty of hard drive space.
I've been unable to visit any Web site with Mozila Firefox 5.x and now 6.x that has Flash content. Previously I had Flash Player 9.x and it was updated on August 13, 2011 to version 10.3.183.5.
I've manually disabled ALL plugins and determined that if I enable only the Shockwave Flash 10.3.183.5 plugin and visit a site that uses Flash content, such as http://www.native-instruments.com, Firefox will instantly crash and present me with the Mozilla Crash Reporter.
I do not have this issue with Internet Explorer 9.x or Google Chrome 13.x.
Other than the long, involved procedure involving the Backdoor.Ulrbot.C virus that Mozilla Support describes, are there any other suggetions you might have.
Thanks very much.

Well, according to http://support.mozilla.com/en-US/kb/Safe%20Mode,
You can elect to make the following changes:
Disable all add-ons: If you select this box and then click Make Changes and Restart then Firefox will start back up in its normal mode, except all your  extensions, themes, and plugins will be disabled (not uninstalled).
So how can Flash Player plugin run in Firefox Safe Mode if it's a plugin and it's disabled?
I've already determined that Flash Player is the problem by having it as the only add-on (plugin) that's enabled. All other extensions and plugins except for Firefox are disabled. My theme is the default one.
The site I visit doesn't matter, if it has Flash content on the page I'm visiting Firefox instantly crashes.

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