I am using server and client systems when i am trying to open the browser in two or more machines it says that firefox is already running, i want to open the browser in all machines simeltaniously

I am using server and clients machines in my office, here i want to open browsers in all systems simultaneously but i am unable open the browser, when i am trying to open the browser in the second machine it says that firefox is already open... pls. solve this problem
Thank you

You can't open one Profile more than once. You need a separate Profile for each browser on each PC that you open.
https://support.mozilla.com/en-US/kb/Profiles

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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

I can't get Firefox to start. It says that Firefox is already running after re-install and re-start it again. I have deleted all profiles, but no luck. HELP!

I can't get Firefox to start. It says that Firefox is already running after re-install and re-start it again. I have deleted all profiles, but no luck. HELP! edit

-> [[Firefox is already running but is not responding]]
-> Profile in use
* http://kb.mozillazine.org/Profile_in_use
Check and tell if its working.

When I try to start Firefox, I get a message saying that Firefox is already running and cannot be re-started, so close down and reboot.

Following an upgrade of my OS from XP to Vista, I tried to point the new installation at my old profile. Now when I try to start FF, I get a message saying that it is already running and I should reboot to clear the problem. I've done that but the problem remains. I have uninstalled firefox and reinstalled v4 beta. The problem remains. Any ideas?

OK, I had moved the profile file inside the profile folder which was created when I installed FF, to the main FF folder. I then took the equivalent file which existed under XP before my upgrade to vista, and moved it into the new Profile folder. That's when I hit the problem described in the initial question.
So, what I did following Tony's response was to move the bookmarks password and cookies files into the profile created on the install. I then moved that file into the profile folder and moved the one I'd saved from XP, out to the main FF folder.
Started FF and voila! All working fine. Thanks for your help.

Firefox will not open or stay open especially when I'm first getting on it for the day. It will sometimes say that firefox is already running and that I have to close it which I don't understand.

Right now I'm staying connected but when I tried it at 2:00 Firefox would not stay connected. It would keep saying not responding. Also sometimes if I would go to fast it would just jam up. I could be connected and then go to my email and it would say lost connection. It just kept changing as though I was getting more that one connection. Hopefully you can help me.

Basically it means firefox didnt Shut down properly and if you close firefox and you try to open it again and you get the message firefox is already running then in windows right click on the taskbar and press on task manager and then once task manager is open press on processes and look for firefox.exe and then where it says End process click that and it will close firefox properly ok and then you can open firefox up again properly ok and for mac its a differnat way ok

Ever since downloading and opening Firefox 4 beta, when I try to launch 3.6.8, I get an error message saying that Firefox is already running; it is not. I have removed 4.0 beta from the computer, but don't know where else to look for any bits and pieces.

I need to restart the computer in order to launch FF 3.6.8. Also, in Dreamweaver CS5, I have defined FF 3.6.8 as my default browser, but when I try to view a page in FF, I get the same message that FF is already running. Where else do I need to look to find hidden files that are causing this?

Did you uninstall the Firefox 4.0 beta version ?
If you did then did you remove the personal data or otherwise removed to Firefox profile folder ?
Make sure that you still have a (default) Firefox profile folder. 
See http://kb.mozillazine.org/Recovering_a_missing_profile

Firefox 4.0.1 sometimes says that "Firefox is already running but is not responding" when I go to open it and I have to restart the computer to get it to open!

There are no more details really. I go to open Firefox (when it is closed) asd it gives me the above message - so I have to restart the machine to open Firefox!

Many thanks for responding. Your suggestion led me to this website:
https://support.mozilla.com/en-US/kb/Firefox%20is%20already%20running%20but%20is%20not%20responding
which infers the problem exists and seems to confirm the only way is to restart the machine.
Not being computer literate I cannot tell whether or not you can get around the 'lock/unlock' problem! What I need is an easy 'fix' but there does not appear to be one!!
Thanks for trying!
Cheers
Mike Barker

Need to install for but mac says that firefox is already installed and I cannot find it.

I am trying to install TOR (had many moons ago and thought I closed it). It says that firefox is already running and I can't open it twice. Possibly I have firefox and possibly I don't. I cannot find it anywhere, nothing to drag to the trash. I want to reinstall it after, but I can't find it anywhere in my computer. I just get the warning when I try to install TOR.

Hello  ,
Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox|here]].
WARNING:Do not use a third party uninstaller as part of this process. Doing so could permanently delete your [[Profiles|Firefox profile]] data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See [[Back up and restore information in Firefox profiles]]. 
Please report back to say if this helped you!
Thank you.

I use Firefox 6.0.2. When I shut the browser and try to reopen it I get a message saying that Firefox is still running and that I should reboot. This happens constantly. Why does this happen and is there a way around it?

I use Firefox 6.0.2. When I shut the browser and try to reopen it I get a message saying that Firefox is still running and that I should reboot. This happens constantly. Why does this happen and is there a way around it?

There are a few possible causes for that error, for details see [[Firefox is already running but is not responding]].

When I use a GSI external antenna for WiFi I first get a message that "Firefox is already running but not responding etc", and then Firefox crashes. Can anyone help please?

Because of weak WiFi signal I need to use an external antenna (GSI USB wireless WIFI long range network adapter). My computer can see the signal clearly and shows that I am connected to the right network. But when I try to launch Firefox I get a message 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." When I click "OK" Firefox tries to load websites but gives up and reports "Problem Loading". It looks like Firefox is having trouble "seeing" the signal from the external antenna. What do I need to do please?

Try Ubuntu support, I don't think your problem is with Firefox - it will use the connection that the Operating System "makes". I'm a real noob with Ubuntu myself, and don't think I can help you figure out the problem.
http://ubuntuforums.org/

I am getting complaints from links that Firefox is already running and needs to be closed when it is not visibly running. But, I do find it as a process that IS running. What gives?

I click on a link in an E-mail. It complains that Firefox is already running and I must close it. Firefox is NOT visibly running. I check via Task Manager to verify. I find Firefox is running as a process. I kill the process and then can proceed. I did use Firefox earlier and closed it.

Make sure that you do not start Firefox with the -no-remote switch or have set the environment variable MOZ_NO_REMOTE=1 (Control Panel > System > Advanced > Environment variables).
If you need to have more than one profile open at the same time then start subsequent instances with the -no-remote command line switch. 
You can send links from other programs to a Firefox instance that is started with -no-remote, you need to drag links in a Firefox window in such cases.
See http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile

When I try to open Firefox, I get a message saying that firefox is already currently running, although it is not running. Close and try again or restart computer. How can I fix this?

I always close Firefox when I am finished with the web. When I try to open it later, I often get a message saying that firefox is currently running, so close it first. As far as I can tell, firefox is not running. The message then says to restart your computer and try again. I restart my computer and then firefox opens.

https://support.mozilla.com/en-US/kb/Firefox%20hangs See '''hang-at-exit'''

Frequently, when waking the computer up from Standby and opening a new browsing session, I get a message that Firefox is already running and needs to be closed, even though it was closed during the previous session. I use Task Manager to close it.

Internet connection is AT&T highspeed DSL via Westell modem. Antivirus is AVG 2011. OS is XP Home SP2, circa 2002.

* [[Firefox is already running but is not responding]]
-> Profile in use
* http://kb.mozillazine.org/Profile_in_use
Check and tell if its working.

When I close firefox it doesn't close. I go to reopen it and it says that it is already running. I have to use task manager to end process to close it before i can log back on.

After browsing and I close Firefox it appears to close.
However when I go to reopen it later I get a message that Firefox is already open and I need to close it. The only wany I can close it is by using Task Manger to end process.

Must be the "hang at exit" problem. You already know how to do Step1; now just determine which Add-on (Extension or Plugin) is causing the problem. 
#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]
#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 signed-in to the forum.'''

My browser has been closed all night and in the morning I get an error saying that Firefox is still running and I need to shut it donw. Why is this?

I close the browser and it does not matter how much time elapses it still says that Firefox is running. I am told to close Firefox before I can open another session. I hit ctrl+alt+del to pull the task manager and it does not show any Firefox applications.

There is no '''5.1''' - Firefox 5.'''0'''.1 was a special version to fix some Mac OSX issues which Apple created with the 10.5 and 10.6 updates and the release of 10.7 Lion last week. Windows and Linux versions don't need those patches and weren't updated. The global download server array can't handle different version numbers for different OS platforms, so the full download versions had to be version number "bumped" for Windows & Linux to match the new Mac version number.
As far as your support question, you probably had a "hung" Firefox '''Process''' - look in the '''Processes''' tab in the Task Manager. 
https://support.mozilla.com/en-US/kb/Firefox%20hangs See '''hang-at-exit'''

I am using server and client systems when i am trying to open the browser in two or more machines it says that firefox is already running, i want to open the browser in all machines simeltaniously

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