This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Wannan tattunawa ta zama daɗaɗɗiya. Yi sabuwar tambaya idan ka na bukatar taimako.

Firefox won't start after fresh re-install

more options

Problem = "Firefox is already running but is not responding" error. Firefox does not open a browser window. I uninstalled firefox, deleted the necessary files in the registry and deleted / backed-up all my profiles.

Still doesn't open. I cannot terminate the firefox.exe in the taskmanager. I also tried to open firefox in safe mode.

my profile.ini looks like this after the reinstall :

[Install308046B0AF4A39CB] Default=Profiles/br44he6u.default-release Locked=1

[Profile1] Name=default IsRelative=1 Path=Profiles/saqp6yc1.default Default=1

[Profile0] Name=default-release IsRelative=1 Path=Profiles/br44he6u.default-release

[General] StartWithLastProfile=1 Version=2

My installs.ini :

[308046B0AF4A39CB] Default=Profiles/br44he6u.default-release Locked=1


Registry files deleted before reinstall :

HKEY_CLASSES_ROOT\FirefoxHTML; HKEY_CURRENT_USER\Software\Mozilla; HKEY_CURRENT_USER\Software\MozillaPlugins; HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla; HKEY_LOCAL_MACHINE\SOFTWARE\MozillaPlugins.

Problem = "Firefox is already running but is not responding" error. Firefox does not open a browser window. I uninstalled firefox, deleted the necessary files in the registry and deleted / backed-up all my profiles. Still doesn't open. I cannot terminate the firefox.exe in the taskmanager. I also tried to open firefox in safe mode. my profile.ini looks like this after the reinstall : [Install308046B0AF4A39CB] Default=Profiles/br44he6u.default-release Locked=1 [Profile1] Name=default IsRelative=1 Path=Profiles/saqp6yc1.default Default=1 [Profile0] Name=default-release IsRelative=1 Path=Profiles/br44he6u.default-release [General] StartWithLastProfile=1 Version=2 My installs.ini : [308046B0AF4A39CB] Default=Profiles/br44he6u.default-release Locked=1 Registry files deleted before reinstall : HKEY_CLASSES_ROOT\FirefoxHTML; HKEY_CURRENT_USER\Software\Mozilla; HKEY_CURRENT_USER\Software\MozillaPlugins; HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla; HKEY_LOCAL_MACHINE\SOFTWARE\MozillaPlugins.

All Replies (1)

more options

Hi Wolf_1981, There have been issues lately with Win 7 x64. Try a Clean Install with the 32-bit version. Firefox keeps crashing at startup Scroll down to Try a clean install.