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I'm using Firefox 3.54 and just upgraded the Firebug add-on to the latest version.
I restarted Firefox but the installation of Firebug wasn't finished properly. In the add-on dialog it says that it will be installed next time I'm restarting - but it won't.
Any idea how to fix this? I have already deactivated all other add-ons but that hasn't helped.
I had this problem installing Firebug 1.7.3 on Firefox 5 (Windows XP), and deleting the profile worked for me. – Eric Wilson – 2011-06-24T12:53:05.567