![]() If you click the Firefox icon but no Firefox window opens and no error message is shown, a simple first step is to restart your computer and then try again. "XML Parsing Error: undefined entity Location", "Secure Connection Failed … uses an invalid security certificate"), see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems. The user that was used to log in to Windows at startup is still the active one. The Firefox application is started using the administrator Windows account.Enter the password required to log in to this account. From the Username drop-down, select Administrator or another user that has administrator privileges. Find the firefox.exe program file in the Firefox application folder on your system.You can either reboot the computer or, if you have an administrator account, you can execute the program as an administrator. 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. If Firefox still does not start, see the Firefox will not start due to security software section below. ![]() If you see the message, "XULRunner - Error: Platform version is not compatible with minVersion "" ("" depends on version number), after a software update, use another browser to download the Firefox installer from the Firefox download page, save it to the desktop or other location, delete the Firefox installation directory and then reinstall Firefox reinstall Firefox reinstall Firefox. See How to install Firefox on Windows for details.
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