Firefox won't run why not?

Today is 9/8/10 this morning I used Firefox and it worked fine but later this evening no matter what I try Firefox won't run. I have yet to try deleting Firefox and re-installing it I would like to avoid this so I dont loose my history or my favorites

A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls

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Firefox 29.0.1 on Windows 7 (64-bit): ALWAYS get "Firefox is already running but not responding..." error and need Task Manager to close/restart Firefox.

I run Firefox 29.0.1 on Windows 7 (64 bit) and I get the "Firefox is already running but not responding. In order to open the program you must close the existing window." error. EVERY TIME I try to start Firefox. The posted solution works to start the program, but it is not a permanent solution. I go through the Task Manager and end the old Firefox process, then I can open a new window. While working, I can open multiple tabs and multiple windows, everything seems to (usually) work the way it should. Then after I completely exit Firefox, in order to open the program again I need to fix the SAME error again. Every time. It doesn't seem to hurt anything really, but it is quite annoying.
I used to get this same error on some of the older Firefox versions but it was only once in a while. With the new 29.0.1 it is literally EVERY TIME I TRY TO RUN FIREFOX!!!!
So, down to the big question: is there a permanent fix for this yet? Or will there be one included in the next version update? Or am I going to have to go back to Internet Explorer? I know I am not alone in this experience; i've seen several other users posting similar questions but none of them received satisfactory answers. So what's the story here, team Firefox?

'''https://support.mozilla.org/questions/997866?esab=a&s=&r=1&as=s'''.<BR>
This is not a cure but will make it easier if Firefox locks up.

On switching on, a message says 'Firefox is already running but not responding...........' then tells me to close it and restart but how can I close it when the page isn't yet displayed?

When I switch on my computer I get the desktop then I try to click on Mozilla Firefox but get the message, 'Firefox is already running but not responding. To open a new window you must first close the existing Firefox process or resart your system.' I looked up how to close but I need to click on 'file' then 'exit'. How can I do that when I can't see the page yet? IE is working fine.

See also [[Firefox is already running but is not responding]]

"Firefox is already running but not responding" - have tried all the usual solutions.

The message I'm getting is the standard: "Firefox is already running, but is not responding." I'm using a PC with Windows 7.
I've tried:
- Opening task manager and manually ending the process. This didn't work because the process is not listed in applications, processes, or services.
- Deleting the parent/lock file. This didn't work because the file is not in any of the firefox folders. I've checked APPDATA/Local/Firefox as well as APPDATA/Roaming/Firefox, and the original install folder just to be thorough. It's not a hidden file either - I have those set to display.
- Creating a new profile and importing settings from the old one. I can't import settings because the old profile is still running.
- Restarting before and after each of these potential solutions, including restarting in safe mode, shutting off the computer and waiting a bit before restarting, etc.
All I really want back are my bookmarks, which I've spent quite a while creating. Unfortunately, there is no file I can find for the default profile that has the bookmarks stored. When I created a new profile, a folder appeared with its name in the APPDATA/Roaming/Firefox folder, with all of the bookmarks, etc. There is no such folder for the default profile though - which is the one I want. I've even tried switching to Chrome and importing bookmarks, but that doesn't work because the bookmarks can't be imported while Firefox is still running.

Does a new profile work?<br />
* http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
If there is no profile present then you also get that error about "Firefox is already running but not responding"
If you uninstalled Firefox at any time in the past and removed your personal data or deleted that profile folder yourself then you no longer have a profile to start with or restore files from.
See:
* http://kb.mozillazine.org/Recovering_a_missing_profile
* http://kb.mozillazine.org/Profile_in_use

I am having trouble with Firefox not closing properly. I close a session and when I try to open firefox again it tells me firefox is already running and not responding.

When I close Firefox and try to open the browser next time it tells me Firefox is already running and not responding.

See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
See "Firefox hangs when you quit it":
*https://support.mozilla.com/kb/Firefox+hangs

It always says:Firefox is already running but not responding; what can i do to fix this problem; it has only started after having downloaded the latest verion.

I downloaded the latest version of firefox and the problem has started; it aways says: "Firefox is already running, but not responding. To open a new window you must first close the existing Firefox process or restart your system; I have to do this about 3 times for the internet to come on again; what can I do, short of calling a technician??

Please read this article: [[Firefox is already running but is not responding]]

I get this message box when I click on a link (in a document or email)"firefox is already running, but not reponding. To open a new window, you must first close the existing firefox process, or restart your system"

if Firefox is already running and click on any link in Word, Excel, Outlook, etc. A message box pops up and I have to hit OK to close it.
"firefox is already running, but not reponding. To open a new window, you must first close the existing firefox process, or restart your system"

if Firefox is already running and click on any link in Word, Excel, Outlook, etc. A message box pops up and I have to hit OK to close it.
"firefox is already running, but not reponding. To open a new window, you must first close the existing firefox process, or restart your system"

Firefox is already running, but not responding to open a new window

I closed the only opened Firefox process that was running. Then clicked the Fox to start Firefox again. I received a message: Firefox is already running, but not responding, to open a new window. You must close the existing Firefox process, or restart your system. This is a stupid message since there is no Firefox in process.
== This happened ==
Not sure how often

Hello Lara.
Hopefully this support article is what you need:
http://support.mozilla.com/en-US/kb/Firefox+hangs#Hang_at_exit

Firefox is already running but not responding,No process in task manager,Restart and uninstall not useful.Profile manager error

So one day when I opened my mozilla firefox Ive got the "Firefox is already running but not responding.To open a new window,you must first close the existing firefox process,or restart your system."
So I checked my task manager but there is no process,I then checked hours in the internet to find a solution.Yes,I also checked for solutions in this site.Then,I try uninstalling and restarting,it also didn't work,Next I also tried downloading profilemanager and tried to run it but as unlucky as I can be,it also didn't work. Please help :(

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!

I am connected to the internet and I close all tabs on the screen. Now I want to open a new tab, but Firefox opens a pop-up window stating"Firefox is already running, but not responding . To open a new window, you must first close the existing Firefox pr

I am connected to the internet, but all tabs are closed. Now I want to open a new tab, But Firefox pops-up with "Firefox is already running, but not responding. To open a new window, you must first close the existing Firefox process, or restart your system". Does anyone here know how to fix this? Thank´s, BL.
== This happened ==
A few times a week

Firefox is shutting down windows I want to remain open. Example: I am done viewing one window. I click the X to shut the window and it shuts two windows. Every single time, attempt to close one windows, two windows close. Lately, I have been opening several windows with nothing but google search, just so it will shut that window and not something else I want to remain open. I could understand this if I was using tabs, but I am not. This has been going on for over two weeks. I don't like going back to history to open a window, I did not want closed in the first place. Isn't that what 'Windows' is all about? Any ideas?

Firefox won't run on occasion. I have to reboot to get it to run.

I'm running win xp on a laptop. firefox has worked fine until recently. now, occasionally, firefox won't run and i have to reboot my machine to get it to run

See this support article and paragraph: <br />
https://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit

Firefox won't run BBC iPlayer when using Netbook with XP and recommended Flash Player.

On my Netbook running XP and a broadband connection, Firefox won't run BBC iPlayer even though it has had the Flash Player upgraded as recommended. The player stalls and won't stream or start a menu for streaming the "live" content from the Radio Station.
The problem doesn't exist when using Google Chrome as an alternative to Firefox. So this is obviously a Firefox incompatibility problem with Flash Player

That's what mine said too when I went direct to their checker.
But I use the Speed Test app and that shows a different IP address, one which links to Orange in the UK.
At the moment it's giving me 31.81.44.53, but that Ip2location site gives me 50.19.92.191. Google tells me I am on 50.16.198.92.
I am confused and frustrated.
I did several full restores yesterday, several times when the phone restarted it gave US as the defualt locaiton at startup, but this morning when I just did a settings wipe, it gave me the UK, and I thought that had fixed it. I didn't.
Very odd.
Gosh I thought I solved it then, one of the sites told me my app Onavo was creating a proxy. Deleting the app didn't help - may have to delete the profile which may be buried elsewhere on the phone. Oh, it's in the General tab under profiles - if you have a profile at all.
Cannot confirm if this works yet as I only have 2G at home but if you have Onavo, I think it's creating a proxy server connection (directing you to the USA). Delete the app, delete the profile and please let me know if it works for you!
Can't be more than 99% certain, but removing my Onavo profile has now given me a UK IP. Should work!

DAQ Assitant Express VI Wizard won't run if not administrator

Running LV 7.1, DAQ Assistant Express VI Wizard won't run if not logged in as administrator. I've given full permissions to the NI folders for Everyone to see if it was a priveliges error but it didn't work for this problem.
What would need to be accessed that an admin has access to, but a typical user doesn't seem to?
Thanks,
Tim

I found another post w/a temporary fix, this one can be deleted.
Thanks,
Tim

Firefox thinks its running but not responding shut computer down won't clear deleted and reinstalled still won't clear , what next?

I have seen this error before and normally if you close down you system and restart it will clear up but not this time. I even uninstalled and reinstalled firefox. started this morning when facebook went down for maintaince. that was about 8 it 2 now and I still can't clear it what can I try next?

See
* [[Firefox is already running but is not responding]]
Try closing any running instances of ''firefox.exe'' (and plugincontainer.exe) using something such as Task Manager. That should allow you to then restart Firefox.
As for iLivid. Possibly it also has associated apps or extensions with names not including the word iLivid. Looking at their own FAQs there are instructions to remove iLivid using the Windows Control panel, and mention of other bundled software that you may wish to remove. It seems it is more of a nuisacne rahter than out and out malware.
* see http://www.ilivid.com/faq.htm (page scrolls for more info) but includes:
How do I uninstall the software?
The software can be removed in a simple was like any other software:
Go to the Windows Start menu and then to Control Panel > Add/Remove ("Programs & Features" in Vista & Windows 7) and click "Remove" next to the software name (e.g iLivid Download manager / Windows iLivid Toolbar ).
During the installation bundle software are offered, each can easily be removed following those instructions: Uninstall Yontoo Addon , Uninstall Search Toolbar (powered by Bing) or Uninstall Babylon.

When I open Firefox I get the message "Firefox is already running but not responding . . .

I am using Firefox 3.6.9 with Windows XP SP3. Almost every time I try to open Firefox I get 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 then must open Task Manager and find Firefox and stop the process.
I run Firefox on 4 Windows machines and this is the only machine that I have this problem on.
I have looked at the Mozilla Firefox KB and have tried to check on the items that could be causing the problem. I have update my Java in Firefox. I have un-installed Firefox leaving the Bookmark preferences, etc. on my machine, ran CCleaner to clean the Registry of remaining Firefox items and then re-installed Firefox - I still have the problem.
I have installed Google Chrome to fix this problem but now I find that several of the websites and companies I do business with are not compatible with Chrome.
How can I fix this problem? Why am I only having this issue on 1 of my 4 Windows machines?
Thanks!
Bill Artman

For possible causes see [[Firefox is already running but is not responding]].

Firefox won't run why not?

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