I am told that Firefox is already open and I should turn it off before continuing to update.
When I open Firefox, I am prompted to update and I say yes. Then it starts to install the update, but a window comes up and tells me that Firefox is already open, when it is not. This also happens when it restarts when I have installed an add-on.
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Do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
Don't remove personal data when uninstalling.
It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
You can skip the step to create a new profile, that is not necessary for this issue.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall