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Firefox has stopped working altogether (Windows 7). It will NOT start. I have uninstalled everything that I could find to uninstall, and then re-installed.

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Firefox has stopped working altogether (Windows 7). It will NOT start. The spinning start up graphic will spin for a moment, and quit. I have uninstalled everything that I could find to uninstall, and then re-installed, but to no avail. I have followed the currently posted suggestions with out success. Any other suggestions?

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Download Firefox Full Installer For All languages And Systems {web link} Save the file. Then;

Using your file browser, open the Programs folder on your computer.

Windows: C:\Program Files C:\Program Files (x86) Mac: Open the "Applications" folder. Linux: Check your user manual.

Look for, and rename any Mozilla and Firefox folders by adding .old to them.

Now run the full installer.

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Same result. The start up graphic spins for a moment and quits. Firefox used to work/has always worked. Whether a combination of OS updates and program updates has rendered the browser useless, I don't know. I've drilled as deep into program files to delete every thing I can locate that are Mozilla/Firefox related so as to start from scratch, without any success.

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Start Firefox in Safe Mode {web Link} by holding down the <Shift (Mac Options) > key, and then starting Firefox. Is the problem still there?

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Yes. Same result, it fails to open.

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  • Do you have a lock file in the profile folder, this is in the Program Files Folder that wad delete before that Fred mentioned.
  • If you run the profile manager and try to open Firefox from a cmd.exe window, what happens?

"C:\Program Files\Mozilla Firefox\firefox.exe" -p

  • Do you have any antivirus that may be blocking Firefox?