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I can't log on to Firefox; I get a message "The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again."

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There seemed to be 2 versions of Firefox on my computer, the second was Firefox Safe Mode which I don't even remember doing. Basically, I need to know if I need to uninstall and then reinstall. If I do that, will I loose my bookmarks and linked sites under those bookmarks?

There seemed to be 2 versions of Firefox on my computer, the second was Firefox Safe Mode which I don't even remember doing. Basically, I need to know if I need to uninstall and then reinstall. If I do that, will I loose my bookmarks and linked sites under those bookmarks?

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Firefox Safe mode is a diagnostic mode that allows troubleshooting.
You start the same version, only some features are disable like add-ons (Tools > Add-ons > Extensions).


See http://kb.mozillazine.org/Software_Update (Software Update not working properly) Remove the files in the updates and updates\0 folder:

C:\Users\<user>\AppData\Local\Mozilla\Firefox\Mozilla Firefox\updates
(%LOCALAPPDATA%\Mozilla\Firefox\Mozilla Firefox\updates)
C:\Users\<user>\AppData\Local\VirtualStore\Program Files\Mozilla Firefox\updates

  • 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.