How to remove an add-on that won't uninstall

I have an add-on that has been fine and working in Firefox for a long time. I had been getting updates to the add-on and updates to Firefox. The last time I updated Firefox the little icon for the add-on disappeared from the toolbar. I thought that maybe in the last update that maybe it wasn't compatible and got disabled, but when I looked at the add-on list, there it was plain as day. So, I went to the website of the makers of the add-on and they said that if it wasn't working to uninstall it, but that's the problem I can't uninstall it. When I press the "uninstall" button, I get the "Do you want to uninstall XXXXX? and when I click "Uninstall" to continue the removal it just does nothing. So now I'm thinking, does this mean that I have to completely uninstall Firefox or can I go into the user profile directory and remove a file and manually force a removal.

Which extension are you referring to?
You can try to remove that extension in [[Safe mode]]
You can remove the folder where that extension is installed in the extensions folder in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder] if uninstalling doesn't work.
Help > Troubleshooting Information > Profile Directory > Open Containing folder
See:
* http://kb.mozillazine.org/Uninstalling_add-ons
* http://kb.mozillazine.org/Uninstalling_toolbars

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