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Failed to read the configuration file: This error is caused by a problem with Firefox program files. The solution is to remove the Firefox program and then reinstall Firefox. (This will not remove your passwords, bookmarks or other user data and settings which are stored in a separate profiles folder.) Uninstall Firefox Delete the Firefox installation directory, found in one of these locations by default: C:\Program Files\Mozilla Firefox C:\Program Files (x86)\Mozilla Firefox 3. Use another browser to download the Firefox installer from the Firefox download page and install it. See How to download and install Firefox on Windows for details. Error opening file for writing If you receive the above error when launching Firefox on a Windows system, you may be required by Firefox to log in as an administrator. You can either reboot the computer or, if you have an administrator account, you can execute the program as an administrator. Find the firef