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Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."

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I keep getting the message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."

I have tried uninstalling and reinstalling. Deleting and reinstalling. Installing on a different drive, etc. It was working fine, then one day, that is all it will say. I'd tried making sure the folder isn't read only. I've also looked for the parental lock folder to delete (and shown hidden files), but it does not exist on any installation that I've done. Running out of solutions aside from the idea that maybe firefox is just broken.

I've also scanned for malware (malwarebytes), spyware (spybot) and done virus scans (AVG Free 2015).

Had a similar problem with IE, but have gotten it fixed by uninstalling and using windows update to update step by painful step from 9 to 11, and remaking my stupid icon.

Windows 7 SP1 Ultimate with all updates. Very nice hardware (but still a slow boot), which makes me still suspect malware of some type, or maybe AVG deleting something important.

I keep getting the message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." I have tried uninstalling and reinstalling. Deleting and reinstalling. Installing on a different drive, etc. It was working fine, then one day, that is all it will say. I'd tried making sure the folder isn't read only. I've also looked for the parental lock folder to delete (and shown hidden files), but it does not exist on any installation that I've done. Running out of solutions aside from the idea that maybe firefox is just broken. I've also scanned for malware (malwarebytes), spyware (spybot) and done virus scans (AVG Free 2015). Had a similar problem with IE, but have gotten it fixed by uninstalling and using windows update to update step by painful step from 9 to 11, and remaking my stupid icon. Windows 7 SP1 Ultimate with all updates. Very nice hardware (but still a slow boot), which makes me still suspect malware of some type, or maybe AVG deleting something important.

額外的系統細節

應用程式

  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; rv:11.0) like Gecko

更多資訊

FredMcD
  • Top 10 Contributor
4248 個解決方法 59418 個答案

From what I have been reading from other posts on this forum, the issue may be caused by the clear history settings. It was suppose to have been fixed in v30.

Type about:preferences <Enter> in the address bar.

Select Privacy.

The button next to History, select Use Custom Settings.

At the bottom of the page, turn on Clear History When Firefox Closes. At the far right, press the Settings button. Turn on ONLY Cache and Form And Search History leaving the others off.

This is not a cure but will make it easier if Firefox locks up in Windows. https://support.mozilla.org/questions/997866 {web link}

From what I have been reading from other posts on this forum, the issue may be caused by the clear history settings. It was suppose to have been fixed in v30. Type '''about:preferences''' <Enter> in the address bar. Select '''Privacy'''. The button next to '''History,''' select '''Use Custom Settings'''. At the bottom of the page, turn on '''Clear History When Firefox Closes.''' At the far right, press the '''Settings''' button. Turn on ONLY '''Cache''' and '''Form And Search History''' leaving the others off. This is not a cure but will make it easier if Firefox locks up in Windows. '''https://support.mozilla.org/questions/997866''' {web link}
FredMcD
  • Top 10 Contributor
4248 個解決方法 59418 個答案

The next time you get that message, STOP ! ! Do you have a quick launch icon for Firefox? If so, right click and select Open New Window. Sometimes this works. Then Menu > File > Exit

The next time you get that message, STOP ! ! Do you have a quick launch icon for Firefox? If so, right click and select '''Open New Window.''' Sometimes this works. Then '''Menu > File > Exit'''

提出問題者

I apologize, I feel I need to clarify.

Firefox is not running. I open it to get it to run (open new window is not an option I have). Before it starts running or pops up, the aforementioned error message appears.

I have tried windows task manager, but no other versions of firefox are running, except when the error message is up.

I apologize, I feel I need to clarify. Firefox is not running. I open it to get it to run (open new window is not an option I have). Before it starts running or pops up, the aforementioned error message appears. I have tried windows task manager, but no other versions of firefox are running, except when the error message is up.

有幫助的回覆

In other words, no fixes that require firefox to run or be open can be used. That is the problem, it will not run, but says it is running, even though it is not according to the task manager.

In other words, no fixes that require firefox to run or be open can be used. That is the problem, it will not run, but says it is running, even though it is not according to the task manager.
FredMcD
  • Top 10 Contributor
4248 個解決方法 59418 個答案

Do you have the Firefox icon on your quick launch? Right click on it, and select Open New Window. Sometimes this works. If it opens, close it by Menu > File > Exit.

Do you have the Firefox icon on your quick launch? Right click on it, and select '''Open New Window.''' Sometimes this works. If it opens, close it by '''Menu > File > Exit.'''
FredMcD
  • Top 10 Contributor
4248 個解決方法 59418 個答案

Go to the Mozilla Add-ons Web Page {web link} (There’s a lot of good stuff here) and search for an add-on that will put a close/quit button icon on the toolbar.

Go to the '''[https://addons.mozilla.org/en-US/firefox/ Mozilla Add-ons Web Page]''' {web link} (There’s a lot of good stuff here) and search for an add-on that will put a close/quit button icon on the toolbar.

提出問題者

I do not have that option.

That seems like it's not actually fixing the problem, and I have to add on more stuff to fix a program that is not working.

Nor does it explain why firefox worked fine, with the same version, two weeks ago.

I do not have that option. That seems like it's not actually fixing the problem, and I have to add on more stuff to fix a program that is not working. Nor does it explain why firefox worked fine, with the same version, two weeks ago.
FredMcD
  • Top 10 Contributor
4248 個解決方法 59418 個答案

The add-on is not a fix, its a convenience.

The add-on is not a fix, its a convenience.
spaarks 0 個解決方法 6 個答案

Thunderbird is already running, but is not responding. To open a new window, you must first close the existing Thunderbird process, or restart your system. If it is already running why can't I see it? I do not have firefox or any other browser running.

Thunderbird is already running, but is not responding. To open a new window, you must first close the existing Thunderbird process, or restart your system. If it is already running why can't I see it? I do not have firefox or any other browser running.