"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.

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I deleted my foxfire profile contents and now get firefox is already running error. reinstall did not help

I deleted the contents of my profile. Now i get the firefox is already running error. i realize that i screwed up. i have restarted, uninstalled, reinstalled, but still firefox will not load.

You can get that error if Firefox can not find the profile folder. For details on what to check see http://kb.mozillazine.org/Profile_in_use

How can I stop from getting the "Firefox is already running" error message when trying to open links and FF has already been opened through a symbolic link?

I use symbolic links and program shortcuts as a way to easily open different Firefox profiles ie. one for casual/personal use and another for work. This works well, but I get the "Firefox is already running, but is not responding" error message if I try to open external links with FF as my default browser. FF is actually open and running fine, but I guess it doesn't acknowledge this fact because of how I'm originally starting the process.
I wasn't able to add the symbolically linked executables to the default program pane. Is there a way to bypass this error or other way to fix this?
The solution to the question linked below is what I'm using to open the different FF profiles.
http://superuser.com/questions/255312/pin-same-app-multiple-times-in-windows-7

hello, this is probably happening when you run the default profile with the -no-remote switch.
http://kb.mozillazine.org/Profile_in_use

I tried a fresh install and get "Firefox is already running" error

Win XP SP3. Links in web pages opened in Firefox were not working. I tried reinstalling latest Firefox version over existing version. Didn't help. Uninstalled Firefox, reinstalled; didn't help. Did a total uninstall including manually removing all Firefox files and folders. Rebooted in-between. Now I keep getting the error message "Firefox is already running ..." Tried the steps in the article in your database but no longer have a profile. Bottom line: can no longer install a working version of Firefox.

You probably did delete the Firefox profile folder, but didn't remove the profiles.ini file, so Firefox isn't able to find the old profile and displays misleading and confusing error message.
* http://kb.mozillazine.org/profiles.ini_file
* https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding
You can delete profiles.ini to make Firefox create a new default profile or use the profile manager to create a new profile.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile

I keep getting this message, what do I do? "Firefox is already running. To open to a new window, you must first close the Firefox process or restart your system. I have done this at least 10x times.plus reinstall and reboot the system.

I was having a compatability issue with another entities website and platform. I was asked to upload my informaiton with Mozilla Firefox. I used this digital platform before employing Internet Explorer to complete my master's program. I am able to install the program, the link picture is on my mainpage, but I am not able to launch it.

Firefox is already running but is not responding
https://support.mozilla.com/en-US/kb/Firefox%20is%20already%20running%20but%20is%20not%20responding?s=firefox+is+already+running&as=s
Check and tell if its working.

"Firefox is already running" error

I am running Windows 7 with 3 different user profiles, all of which run Firefox seamlessly, but one. I have tried the different options listed on the main forum for this; however, the issue persists. I have uninstalled and reinstalled the application, with no success. The only thing I did have problems understanding/completing was finding the profile for the one user>parent.lock file. I never found this file. I'm not sure, at this point, what else to do. I have run a virus scan and it's all good. Any suggestions? What am I missing here?

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.

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Have done as per the link but still not opening
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*   EV_FUNCNAME_INBOUND        =
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    wa_ztbglerc050           = wa_ztbglerc050
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    wa_41                    = wa_41
    it_42                    = it_42
    wa_43                    = wa_43
    it_44                    = it_44
    it_45                    = it_45
    it_46                    = it_46
    it_47                    = it_47
    it_48                    = it_48
importing
    /1bcdwb/formoutput       = formoutput
exceptions
    usage_error              = 1
    system_error             = 2
    internal_error           = 3
    others                   = 4
if sy-subrc <> 0.
* Implement suitable error handling here
endif.
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* IMPORTING
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I have enabled IRMS settings at a document library in my site. I am having full control access to the site but I am not able to open any files under the library. I get an error message which says " cannot verify user information at this time. Do you
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Per my knowledge, for AD RMS to work properly, all users must have an email attribute to protect and consume content.
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If Firefox is set as the default browser, and any application attempts to open a new window, this fails and I get the error "Firefox is already running..."

Here is what I am running:
Microsoft Windows 7, Service Pack 1, Fully updated to 4/10/2012
Fresh Install of Firefox 11. No add-ons enabled as a result of troubleshooting.
I am a user with administrator rights
UAS is disabled.
To begin, this has been going on Since Firefox 10 or so. A few months now.
I am able to open Firefox. My add-ons worked (ABP, Flashblock, ABP Element Hiding Helper, IETAB2, Downthemall, Greasemonkey, 4chan extension) had no problems. Firefox is set and has been set for the last two years as my default web browser.
However Since approximately Firefox 10 or so, maybe before that, If I have a Firefox session open, and any other application attempts to open a session in a new window, I get the Firefox is already running, but not responding error."
I attempted to follow troubleshooting advice already posted (look for parent.lock files left behind [none present], multiple sessionstore.js files [none present], create a new user profile, attempted to clear out the "read-only" permission in windows 7, however as soon as it is cleared, the read only permission returns.)
As a last resort, I deleted the Firefox folder, the %APPDATA%/Mozilla directory in its entirety, then utilized CCleaner to remove any and all references to Firefox in the windows registry, then did a full re-install, no extensions installed right now.
I checked preferences and have the option "open new windows in a new tab" checked off. The problem persists regardless if this option is checked on or off. This problem persists in or out of safe mode, even with the brand new install.
Test Cases:
All cases:
Firefox is selected as the default browser for windows 7
Case 1: Open a firefox session. Utilize any other program that attempts to open a link to their website in a new browser window or new browser session. Experience "Firefox is already running" error
Case 2: Open a firefox session. Right click on Firefox on the task bar. Select "open in new window". Experience "Firefox is already running" error
Case 3: Open a firefox session. Select the Firefox Menu > New tab > New Window. A new window will actually open.
This is the only method of opening a new window in the same browser session or profile that actually works on my system. Attempting to open a browser session from the task bar "open new window dialog" or opening a new window while a current window/session is running will not open firefox in a new window or a new tab in the current session. The "Firefox is already running, but is not responding" error will occur every time.

Cor-el's suggestion resolved my problem. Apparently the MOZ_NO_REMOTE variable was set to 1 on my system variables. I never made it, and really have no idea how it got there, but deleting this variable and restarting firefox has resolved the issue. Thanks Cor-el!
Marking case: Solved
Solution: Verify the MOZ_NO_REMOTE variable is NOT set to 1. This can be achieved by simply deleting this variable.

When I try to access Firefox I get this message: "Firefox is already running, but is not responding. To open a new windwo, you must first close the existing Firefox process, or restart your computer."

When I click on Firefox I get a window that says: "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your computer." I can't see where anything is running on firefox. I restarted the comuter and I shut down the computer. I also ran a full scan of the computer.

Sorry I am a PC user but have you seen
* [[Firefox is already running but is not responding]]
Firefox will be hanging for some reason. The quick solutions to kill the process and try again. The next step is to try to see if it will start and exit normally a couple of times, if so the problem is solved. If not the reason needs further investigation.
See [[firefox hangs]]
An immediate likely culprit after repeated problems are the duplicate session restore files, as discussed in the above KB article.

When I try to start Firefox I get 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 get this message when I try to start Firefox after first logging on after turning on the computer.
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.
Have rebooted. Works when Administrator logs in, just does this in my user profile. Have also re-intalled. Mo change in my User account.
Firefox was working fine for the last 3 1/2 years. Any suggestions?

Firefox is "hanging at exit" when you exit/quit Firefox.<br /><br />
#Stop the Firefox process:
#*[http://kb.mozillazine.org/Kill_application Mozillazine - Kill application]
#*Windows 7 users click [http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576 here]
#*Mac users: http://techheavy.com/2011/02/the-mac-task-manager/
#Why Firefox may hang:
#*[http://support.mozilla.com/en-US/kb/Firefox+hangs Firefox hangs] (see Hang at exit)
#*[http://kb.mozillazine.org/Firefox_hangs Firefox hangs (Mozillazine)] (see Hang at exit and Closing Firefox properly)
#*[https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding Firefox is already running but is not responding]
#Use Firefox Safe Mode to find a problem with an Extension or Plugin:
#*Don't check anything when entering Safe Mode, just continue
#*If the problem does not occur in Safe Mode it is probably and Extension or Plugin causing the problem
#*See:
#**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
'''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''

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. How do I fix this? I am ready to go back to internet explorer!

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.
This box appears and then firefox quits...never opens.
I have uninstalled, and loaded firefox 5 times and never got it to run.

See [[Firefox is already running but is not responding|Firefox is already running but is not responding]].

I open firefox it keeps saying"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 tried restart my computer...but it's still keep saying that..pls help me..

As I stated above, I have to constantly restart my computer because I get a message stating firefox is already running.

Do you see a firefox.exe in the Task manager if you look there right after you get this error message?
You do not have to restart the computer, just kill that process.
This situation may occur if Firefox was not closed correctly or crashed.

I getthe 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. It is NOT open I onlly have one computer

I installed FF on my new computer, Windows 7 Toshiba, 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'''. It is NOT open I only have one computer.
I had a computer expert try everything and we cannot get it to open.

Look for the firefox process firefox.exe and kill it with for instance task manager. it is also worth watching for plugincontainer.exe.
The problem and solutions are explained in the articles:
* [[firefox is already running but is not responding]]
*[[firefox hangs]]

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

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