Firefox upgrades will not install on my Mac with OSX 10.8.2, I am stuck on Firefox 13

I have a mid 2012 MBP with Retina display. When I try to install Firefox upgrades i Get the message that teh update will not be installed, are you running more than 1 copy of Firefox. This occurs no matter what I try even from a restart. Activity monitor only shows one copy of Firefox running
I reset Firefox to the default and that did not help, I started in safe mode and that did not help.

Hi mike_bauer
If there is an issue with update or permissions the better, quickest and safest way is to '''download and install''' firefox:
1. Download a copy of the latest firefox from http://www.mozilla.org/en-US/firefox/all.html
2. '''''Trash''''' the current Firefox application to do a clean install.
3. Install the version that you have downloaded.
Do not select to remove your personal data, your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks or other personal data.
see also: [https://support.mozilla.org/en-US/kb/install-firefox-mac?redirectlocale=en-US&redirectslug=Installing+Firefox+on+Mac Installing Firefox on Mac]
thank you
Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

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