FireFox 5 Claims it is already running on Open -Win7

Setting up a new DELL Win7 Prof. System. Downloaded latest 5.x. Ran fine once. Now upon clicking the Firefox Icon get the following window 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."
- No firefox labeled process shows in task manager.
- Re-start same message.
- Uninstall/ reinstall same message.
No Joy.........

See if the solutions given in this article help: [[Firefox is already running but is not responding]].

Similar Messages

Firefox will not start, advising already running, but WIN 7 Task Mgr says nothing else running. This is big prioblem!!!

Can't get Firefox started. Instead advice given that it's already running and to close it down. BUT, Windows 7 Task manager advises that neither Firefox nor anything else is running. The only way I can remedy the problem is to restart computer, and I am getting a bit weary of this. I've had this problem before I recently updated Firefox.. I never have this problem with Explorer or AOL, both of which are and always concurrently running just fine.

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

Everytime I try to open firefox it says it is already running. I restarted it, and unistalled it and it still says it's running?? What to do?

When I try to open firerox I get a pop up saying it's already running? I checked the taskbar to see if there are any firefox running, there were not, so I restarted my computer and I still got the same error message. So then I uninstalled firefox from my computer and then reinstalled, now I'm still getting the SAME error message!

See:
* [[Firefox is already running but is not responding]]

PDFs opening twice using 'open with Firefox' when browser is not already running

Windows 7 - Firefox 15*-16*
if Firefox is not already running, opening a PDF document using Firefox (eg right-clicking PDF from desktop, selecting 'open with > Firefox) is always causing Firefox top open the PDF in two different windows.
Happening with PDF plugins enabled and disabled.
Maybe this is a bug and I should report as such?

You can check for problems caused by DDE in Windows.
*http://kb.mozillazine.org/Windows_error_opening_Internet_shortcut_or_local_HTML_file_-_Firefox

How do I stop Firefox from claiming to have sessionrestore errors or opening the wrong session items and/or remember the wrong window size and/or position.

Since automatically updating to version 25 Firefox is randomly opening recent tabs and windows from the browsing history, and/or randomly positioning the browser window from history.
Currently using Firefox 25.0.1 on Windows Vista and Windows 7. Problems started immediately after automatic updates to 25.0.0. Problems are most noticeable on the Vista box because it has so much screen geography (the Windows 7 box is a laptop).
Problems include:
Firefox may open the correct tabs into a properly sized and positioned window, without problem. (Not a problem, included for completeness since it does, occasionally, work without error).
Firefox open a single empty tab (about:blank, my Home page). (Listed as a problem because Firefox simply forgot the tab which was open.)
Firefox may claim it cannot open the correct tabs and pop up about:sessionrestore. Proceeding will open all tabs (usually only one or two for me). This gives the impression Firefox did not actually have a problem. But, then, often, the tab Firefox is having problems restoring is about:blank so I should hope there was no problem!
Firefox may open randomly selected recent browsing items, without other problems. This gives the impression that Firefox does not properly record recent history for about:sessionrestore. Checking History appears correct; Firefox simply reached back hours, or days, or even weeks, and restored a random session from long ago.
Any of the above may occur, but the window position and/or size will be randomly selected from another recent history item. This is most noticeable when the position is on the wrong monitor and can be annoying since Firefox simply "disappears" if (as it often is for me) that other monitor is disconnected or powered off.

If you use cleanup software like CCleaner then check the settings for the Firefox application. 
Also make sure that your anti-virus software doesn't mess with files in the Firefox profile folder.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
You can check for problems with the sessionstore.js and sessionstore.bak files in the Firefox profile folder that store session data.
Delete the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox profile folder.
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Multiple_profile_files_created
Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost and you will have to recreate them (make a note or bookmark them if possible).

When I go to open Firefox it saay it's already running and I have to close the program but it's not running. How do I fix this? It will let me run it as the asministartor tho...

Firefox won't let me open unless I run as administrator. How do I fix this?

can not connect with "STARHAWK" u was going to try an help with moniter probles .tring to send STARHAWK this information. Help form says not connected, but i am.
HI Starhawk
thanks for your time. I really only know how to turn on a computer & use it somewhat had stroke 2 years ago lost some long term memory get bouts of short term loss. Got computer from , unregistered charity in Victoria BC, Canada.. Which supply computers & basic instruction only 2 techs, told reach out to Linux forms as very old monitor big in small bacholar apt works, IBM e74 13 pins on cord going to computer computer has 15 holes as do flatron wide LG & flatron w9345 i have 37" RCA with 15 pin holes & 15 pin cord both ends but don,t want mess up my TV .Any one i know who is computer savvy don't know Linux or want to try I have Zorina Linux & Linux puppy 5.25. Computer has windows xp professional sticker on it. that is about it. Any help u can suggest would rally great if there is a fix. I like the system it is good for me, as it challenges me. Again THANKS
Victoria52

Alt+[m] calls up a new instance of Firefox when one instance is already running??

I have another program, DataCad v15, which uses macros. Alt+[m] is one of those macros and it will call up a new instance of Firefox when using DataCad. In trying to trouble shoot the problem I found that entering the macro when DataCad is NOT running, it will call up a new instance of Firefox. Any explanation for this????

More info:
I have been using DataCAD and the fore-mentioned macro for years. I have been using FireFox for years although not as long as DataCad. I never had this problem before!
I have solved the problem by changing out the keyboard and (wireless Logitech) mouse. '''BUT''' there have not figured out the cause. The keyboard (s. I have 3) is a Gateway Anykey programmable keyboard (with another set of function keys on the left - very useful in DataCad. Keeping the new mouse (wired MS) and switching back to the Gateway keyboard still calls up FireFox despite "de-programming" all programmed macros and re-mapped keys several times.
I can find no documentation about Alt+m, as a macro for calling up FireFox in MS XP or Mozilla, so that mystifies me. This problem exceeds my computer expertise.
Stephen

When I close firefox and put my computer to sleep, the next day try to run firefox and it says its already running and I have to close it first; I have to ctrl+alt+delete to end the process and THEN start firefox.

The only other way to avoid this problem is to fully shutdown, or restart my computer.

There are other things that need attention.
Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
# Shockwave Flash 10.0 r22
# Next Generation Java Plug-in 1.6.0_15 for Mozilla browsers
Update the [[Managing the Flash plugin|Flash]] plugin to the latest version.
*http://www.adobe.com/software/flash/about/
Update the [[Java]] plugin to the latest version.
*http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)

Firefox is not visibly running, but says 'cannot start as already running'. How do I stop it?

Firefox comes up with ' is already running....close and restart', but no visible firefox is running and even in task manager it is not running. How do I 'stop' firefox? Restarting the computer did not help
== This happened ==
Just once or twice
== User Agent ==
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)

i have same prob but not just once or twice, regularly-at least once a day- and still does it after restart. it's diving me mad....arghh

Why does firefox now tell me that it is unable to load the browser because firefox is already running?

After the last 2 updates I have had trouble with the browser. It periodically tells me that I am unable to run firefox because the process is already running. I then need to go to the task manager, stop the firefox process before I can launch the browser

See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

Firefox claims that it is already running and will not let me start a new session after closing out

I've been having this problem intermittently on both my Dell XPS 8000 and my HP nx7400 laptop. The Dell is running the latest version of Windows 7 Pro and the HP is running XP Pro (fully updated). After closing out of a Firefox session and running other apps, Firefox will not let me initiate another session, saying that "Firefox is already running... Please close the session..." That's not an exact quote, but you get the idea. CTRL-ALT-DEL and all other conventional means don't work and I am forced to reboot the system. This is a royal pain.. and I need some pain relief! Any suggestions? I may revert to an earlier version of Firefox until I see a solution... can't hurt, but I really like 4.0 and I don't look at going backwards as "progress."
Thanks.
Tom

Sounds like it is hanging when you exit and later try to restart Firefox.
* How to stop the running Firefox process
** In Task Manager, does firefox.exe show in the '''Processes''' tab?
** See: http://kb.mozillazine.org/Kill_application
**Windows 7 users: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
* What may cause Firefox to hang at exit
**Windows 7 Task Manager: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
** http://support.mozilla.com/en-US/kb/Firefox+hangs
** http://kb.mozillazine.org/Firefox_hangs
** https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
* You may need to try Firefox Safe Mode
** You may need to use '''Safe Mode''' to locate the problem:
***See: http://kb.mozillazine.org/Safe_Mode
***Firefox 4 users, hold the Shift key while clicking the Firefox 4 desktop icon to enter Safe Mode.
***Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox.
****In Firefox 4, Safe Mode also disables Plugins and Hardware Acceleration.
****If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes '''before''' starting Safe Mode (In Firefox 4, Tools > Add-ons > Appearance). See: http://support.mozilla.com/en-US/kb/Using%20themes%20with%20Firefox#w_managing-themes-and-personas
****When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode".
****Test to see if the problem you are experiencing is corrected.
*** If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it
***#by enabling '''one at a time''' until the problem reappears.
***#You can also enable a few at a time (3-5), keeping track of what you just re-enabled to see if the problem re-occurs; this will help narrow down the possibilities if you have a large number of add-ons.
***#'''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit).
***#You can use "Disable all add-ons" on the Safe Mode start window.
**See the following for more information
*** http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting
 
 
'''You need to update the following.''' The Plugin version(s) shown below was/were submitted with your question and is/are out of date. You should update to avoid known security issues with the version(s) you have installed. Click on "More system info..." to the right of your question to see what was included with your question.
*Next Generation Java Plug-in 1.6.0_24 for Mozilla browsers
#'''''Check your plugin versions''''' on either of the following links':
#*http://www.mozilla.com/en-US/plugincheck/
#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
#*There are plugin specific testing links available from this page:
#**http://kb.mozillazine.org/Testing_plugins
#'''Update the [[Java]] plugin''' to the latest version.
#*Download site: http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)
#**'''''Be sure to un-check the Yahoo Toolbar option during the install if you do not want it installed.
#*Also see "Manual Update" in this article to update from the Java Control Panel in Windows Control Panel: http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates
#* Removing old versions (if needed): http://www.java.com/en/download/faq/remove_olderversions.xml
#* Remove multiple Java Console extensions (if needed): http://kb.mozillazine.org/Firefox_:_FAQs_:_Install_Java#Multiple_Java_Console_extensions
#*Java Test: http://www.java.com/en/download/help/testvm.xml

Frequently when I open Firefox it says Firefox is already running but is not responding. I have to go to the task manager, find Firefox and close the process before I can get firefox to load.

Those are all the details I have

There is an article about this problem see:
* [[Firefox is already running but is not responding]]

"Firefox is already running" error while opening a Firefox Document

I am a web developer, so I decided to have different versions of Firefox in order to test my web pages.
Thus I decided to install Firefox 3.6 in "C:\Archivos de programa\Mozilla Firefox\Firefox 3.6", Firefox 4 in "C:\Archivos de programa\Mozilla Firefox\Firefox 4" and Firefox 5 in "C:\Archivos de programa\Mozilla Firefox\Firefox 5".
Moreover, each version has its own profile. In 'profiles.ini' I moved the line 'Default=1' from 'default' profile to 'Firefox 5' profile.
Since then, if Firefox has started, when I try to open a Firefox Document (like .htm or .xml) from a folder, I get "Firefox is already running, but is not responding" error. But the fact is that Firefox is responding correctly. If I write the file's location in Firefox's location bar it works properly.
In the registry, the FirefoxHTML's open command is "C:\Archivos de programa\Mozilla Firefox\Firefox 5\firefox.exe" -requestPending -osint -url "%1". Is it rigth?

I don't have much difficulty with this problem. It's more of an annoyance.
A ''frequent'' annoyance.
What I'll do is log in to a page that requires a secure connection, and when I'm finished, to complete the security, I always close the browser. Then, of course, I start the browser up again.
The problem is, ''Firefox is still shutting down'', and issues this error. Most of the time, I can wait 10 seconds, then start up fine.
'''So my question is,''' why the heck can't the process that detects that Firefox is still running do the waiting for me? Instead of popping up a message, "Firefox is still running", pop up a message, ''"Firefox is cleaning up from the last shut-down, one moment please"'', then start up again.
I hate to mention it, but none of Firefox's competitors have any problem with starting up too soon after a shut-down.

When I attempt to open firefox an error message appears telling me that firefox is already running, but I can't find it running. How do I do so or in any case close the already running Firefox process?

When I attempt to open Firefox instead of Firefox opening, an error message appears saying "Firefox is already running but isn't responding. To open another window please close the existing Firefox process or restart the system.", but I can't find that process of Firefox in order to kill it, and after restarting the system there is still the problem. I have found an emergency fix to at least get online, and that is to use"Firefox_Profile_Manager" in the start menu's "run" start menu, but the
Firefox that then opens is that one doesn't carry over what I had in my bookmarks but starts bookmarks anew.

Sounds like it is hanging when you exit and later try to restart Firefox.
* How to stop the running Firefox process
** In Task Manager, does firefox.exe show in the '''Processes''' tab?
** See: http://kb.mozillazine.org/Kill_application
**Windows 7 users: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
* What may cause Firefox to hang at exit
**Windows 7 Task Manager: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
** http://support.mozilla.com/en-US/kb/Firefox+hangs
** http://kb.mozillazine.org/Firefox_hangs
** https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
* You may need to try Firefox Safe Mode
** You may need to use '''Safe Mode''' to locate the problem: ***See: http://kb.mozillazine.org/Safe_Mode
***Firefox 4 users, hold the Shift key while clicking the Firefox 4 desktop icon to enter Safe Mode.
***Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox.
****In Firefox 4, Safe Mode also disables Plugins and Hardware Acceleration.
****If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes '''before''' starting Safe Mode (In Firefox 4, Tools > Add-ons > Appearance). See: http://support.mozilla.com/en-US/kb/Using%20themes%20with%20Firefox#w_managing-themes-and-personas
****When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode".
****Test to see if the problem you are experiencing is corrected.
*** If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it
***#by enabling '''one at a time''' until the problem reappears.
***#You can also enable a few at a time (3-5), keeping track of what you just re-enabled to see if the problem re-occurs; this will help narrow down the possibilities if you have a large number of add-ons.
***#'''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit).
***#You can use "Disable all add-ons" on the Safe Mode start window.
**See the following for more information
*** http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting
 
 
'''You need to update the following:'''
*Adobe Shockwave for Director Netscape plug-in, version 11.5
*Adobe PDF Plug-In For Firefox and Netscape "9.3.2"
*Shockwave Flash 10.2 r153
*Next Generation Java Plug-in 1.6.0_17 for Mozilla browsers
#'''''Check your plugin versions''''' on either of the following links':
#*http://www.mozilla.com/en-US/plugincheck/
#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
#*There are plugin specific testing links available from this page:
#**http://kb.mozillazine.org/Testing_plugins
#'''Update Shockwave for Director'''
#*NOTE: this is not the same as Shockwave Flash; this installs the Shockwave Player.
#*Use Firefox to download and SAVE the installer to your hard drive from the link in the article below (Desktop is a good place so you can find it).
#*When the download is complete, exit Firefox (File > Exit)
#*locate and double-click in the installer you just downloaded, let the install complete.
#*Restart Firefox and check your plugins again.
#*'''Download link and more information''': http://support.mozilla.com/en-US/kb/Using+the+Shockwave+plugin+with+Firefox
#'''Update Adobe Reader (PDF plugin):'''
#*From within your existing Adobe Reader ('''if you have it already installed'''):
#**Open the Adobe Reader program from your Programs list
#**Click Help > Check for Updates
#**Follow the prompts for updating
#**If this method works for you, skip the "Download complete installer" section below and proceed to "After the installation" below
#*Download complete installer ('''if you do NOT have Adobe Reader installed'''):
#**SAVE the installer to your hard drive (save to your Desktop so that you can find it after the download). Exit/Close Firefox. Run the installer you just downloaded.
#**Use either of the links below:
#***https://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox ''(click on "Installing and updating Adobe Reader")''
#***''Also see Download link''': http://get.adobe.com/reader/otherversions/
#*After the installation, start Firefox and check your version again.
#'''Update the [[Managing the Flash plugin|Flash]] plugin''' to the latest version.
#*Download and SAVE to your Desktop so you can find the installer later
#*If you do not have the current version, click on the "Player Download Center" link on the "'''Download and information'''" or "'''Download Manual installers'''" below
#*After download is complete, exit Firefox
#*Click on the installer you just downloaded and install
#**Windows 7 and Vista: may need to right-click the installer and choose "Run as Administrator"
#*Start Firefox and check your version again or test the installation by going back to the download link below
#*'''Download and information''': http://www.adobe.com/software/flash/about/
#**Use Firefox to go to the above site to update the Firefox plugin (will also install plugin for most other browsers; except IE)
#**Use IE to go to the above site to update the IE ActiveX
#*'''Download Manual installers'''.
#**http://kb2.adobe.com/cps/191/tn_19166.html#main_ManualInstaller
#**Note separate links for:
#***Plugin for Firefox and most other browsers
#***ActiveX for IE
#'''Update the [[Java]] plugin''' to the latest version.
#*Download site: http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)
#**'''''Be sure to un-check the Yahoo Toolbar option during the install if you do not want it installed.
#*Also see "Manual Update" in this article to update from the Java Control Panel in Windows Control Panel: http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates
#* Removing old versions (if needed): http://www.java.com/en/download/faq/remove_olderversions.xml
#* Remove multiple Java Console extensions (if needed): http://kb.mozillazine.org/Firefox_:_FAQs_:_Install_Java#Multiple_Java_Console_extensions
#*Java Test: http://www.java.com/en/download/help/testvm.xml

When I click to open firefox it says that "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" and I've tried to shut down and restart my computer but it keeps

when i click to open firefox it says that "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." and I've tried to shut down and restart my computer but it keeps showing the same message. I've even uninstalled Firefox and then reinstalled in the hopes that the problem would be solved but it this message is still popping up. What can I do to solve this problem?
== This happened ==
Just once or twice
== I was on facebook trying to upload pictures yesterday. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0; InfoPath.1)

Do you have a profile lock file in your profile folder? If so, delete it and see if TB runs properly:
http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file

FireFox 5 Claims it is already running on Open -Win7

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