My version has this on the launch page: URGENT! Your version of Firefox is no longer protected against online attacks. Get the upgrade - it’s fast and free! But when I go through the upgrade process it won't launch.
I persist in receiving the message that other copies of Firefox are running and so the new one cannot be installed. This happens even when I make sure that no copies on this shared computer are running. Computer is an iMac.
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The Firefox 3.5.x branch has reached end-of-life and is no longer maintained.
You will no longer receive security updates for that Firefox version.
You can update Firefox via "Help > Check for Updates" or download and install the latest Firefox 3.6.x or 5.0.x version if updating doesn't work.
If you have problems with updating or with the permissions then easiest is to download the full version and trash the currently installed version to do a clean install of the new version.
Download a new copy of the Firefox program and save the DMG file to the desktop
- Firefox 5.0.x: http://www.mozilla.com/en-US/firefox/all.html
- Trash the current Firefox application to do a clean (re-)install
- Install the new version that you have downloaded
Your profile data is stored elsewhere in the Firefox Profile Folder, so you won't lose your bookmarks and other personal data.