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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.)

1. Uninstall Firefox
2. 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.

1. Find the firefox.exe program file in the Firefox application folder on your system.
2. Right-click the icon.
3. Select Run As Administrator Select The user:  From the Username drop-down, select Administrator or another user that has administrator privileges. Enter the password required to log in to this account. Click OK.
4. The Firefox application is started using the administrator Windows account. The user that was used to log in to Windows at startup is still the active one.

 Mozilla Firefox Fast Browsing Support for Mozilla Firefox users, Solve your queries related to Mozilla like firefox crashing, Mozilla Firefox account issues, support for Mozilla browser safe mode and install, reinstall Mozilla Firefox Browser, firefox browser reset, how to fix the mozilla error, repair Mozilla Firefox browser. You can solve your problems related to Mozilla Firefox here from our experts. 

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