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Upgrade failed, it corrupt my Firefox and now won't open at all???

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  • Τελευταία απάντηση από cor-el

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I just received a notice this a.m. to upgrade Firefox. I accept it and followed the defaults. Now, FF won't open at all.

I just received a notice this a.m. to upgrade Firefox. I accept it and followed the defaults. Now, FF won't open at all.

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Do a clean (re)install and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\).

Download a fresh Firefox copy and save the file to the desktop.

Uninstall your current Firefox version if possible.

  • Do NOT remove personal data when you uninstall the current version or you lose your bookmarks and other data in the profile folder.

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

  • 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.

Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.


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I followed the instructions by doing an 'Uninstall' and then I removed the folder. I then click on your link to download a freash copy and after selecting run, I get the message again about a file being corrupt. What do I do now?

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It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files by Firefox.

Try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that makes downloading work.

See "Disable virus scanning in Firefox preferences - Windows"