Firefox keeps crashing at startup

Revision Information
  • Revision id: 85987
  • Created:
  • Creator: AliceWyman
  • Comment: Making this article apply to other startup crashes fixed by a clean reinstall
  • Reviewed: Yes
  • Reviewed:
  • Reviewed by: AliceWyman
  • Is approved? Yes
  • Is current revision? No
  • Ready for localization: Yes
  • Readied for localization:
  • Readied for localization by: AliceWyman
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If crashes are preventing you from starting Firefox, a clean install will often fix the problem. Here's how to do it:

  1. Uninstall Firefox from your computer.
  2. Delete the Firefox installation folder (located in one of these folders by default):
    • C:\Program Files\Mozilla Firefox
    • C:\Program Files (x86)\Mozilla Firefox
  3. download firefox win 32x32 Download a fresh copy of Firefox.
  4. Double-click on the downloaded file and follow the prompts to continue the installation process.

For more information on how to install Firefox, see How to install Firefox on Windows

  1. Delete Firefox from the Applications folder.
  2. mac download 32x32 Download a fresh copy of Firefox.
  3. Open the downloaded file and drag the Firefox icon to the Applications folder when prompted.
  1. Use your distributor's package management system to uninstall Firefox (please refer to their documentation). If that doesn't work, delete the Firefox folder from your Home folder.
  2. Install Firefox through your package management system or follow these steps to manually install Firefox:
Will I lose my bookmarks, passwords and add-ons? A clean install will not delete your bookmarks, saved passwords, add-ons or other personal information. This information is stored separately in your profile folder.