Firefox hangs on open wirh Not Responding

There are no other details. It simply won't respond after it opens. It sits there with Not Responding.

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.
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link}
Type '''about:preferences''' in the address bar and press '''Enter.'''
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.

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When closed and i try to open a hiper link i get statment firefox is aready open but not responding and i have to reset system to get it back. Is this a glitch of just my system?

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 a spread sheet with all my hyper links and i select websites that way and firefox has done this to me starting with 3.6 beta and now 5''
"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."
''There is only one window open the spread sheet.''
Firefox selected as default browser. Running Windows XP, Spread sheet Microsoft Excell.

Why does my Lightshop 5.6 hangs on opening with "not responding" at top of screen.

I managed to use the programme for the first time after original install. Next day it just hung on opening with the panels all their on screen but with the splash screen still centre and "not responding" at top of screen. I am totally new to Lightroom and set it up using Scott Kelby's book Lightroom 5 everything appeared to set up properly. I uninstalled the programme and reinstalled exactly same thing has happened. Is their a maximum caralog size that is usuable, mine is 2.7TB and is on one of the desktop's 3 discs.
Advice please, thanks

No, but try terminating and restarting Safari:
1. Press the Home button
2. Double click the Home button to bring up the "Recent Apps" tray.
3. Touch and hold on the Safari icon in the "Recent Apps" tray until a "-" appears.
4. Touch the "-" to terminate Safari.
5. Restart Safari and see if your Bookmarks are back.

Firefox hangs with a "Script not responding" error message; in the meantime there are more and more flashplayer instances running

Recently I receive errors from Firefox at sites that were working fine before, always the same: a script is not responding, and I can wait, debug or stop. Waiting doesn't help (therefore pointless to change the 'dom.max_script_run_time' setting in the config); and also pointless to debug because the problem is not with the script. "Stop" eventually gets firefox to work, until the next error message which comes very soon.
I tried to reinstall both Firefox and Flashplayer, even manually wiped the traces from the user profile and program files. They are the latest 35.0.1 and 16.0.0.305 available now.
=> In the meantime, there are reproducing instances of flash players are spawned and running. They stay running even after firefox is closed or terminated.
=> if I disable the flash player plugin everything's fine except of course flash is not working. If I re-enable it, the problem starts over.
OS is Windows 8.1

Retard, (I know that sounds hilarious, but I don't know your name - no offense please! )
Like you said, if this happens only primarily on one of the many sites, it generally comes down to the type of code on that site.
And after looking at the URL you posted, seems like that page uses a lot of external references - JS and CSS.
Especially the last few lines:
<script type="text/javascript" src="http://njcdn.worldsecuresystems.com/CatalystScripts/Java_OnlineShopping.js?vs=b1763.r38875 7"></script>
<script type="text/javascript" src="http://njcdn.worldsecuresystems.com/CatalystScripts/Java_Cookies.js?vs=b1763.r388757"></script>
<script type="text/javascript" src="http://njcdn.worldsecuresystems.com/CatalystScripts/Java_Box.js?vs=b1763.r388757"></script>
Also, a couple CSS, JS references in the <head> section.
'Display External Files' only disables showing external files - but still loads them.
Can you try removing the external references and try working with the webpage in DW for a few minutes to see if the same problem persists? If it does, we know what was causing your issue.
Also, run your site through W3 validator to check and resolve errors: http://validator.w3.org/check?uri=http%3A%2F%2Fwww.healthfirst.com%2Facls-kit.html&charset =%28detect+automatically%29&doctype=Inline&group=0
Let us know how it goes.
Good luck.
-ST

I think somebody is hacking my visiting websites and ip address.Some sites are not opening.When I am trying to open mozilla 1 message box is being displayed stating that one firefox is being opened and not responding first close it & restart the system.

At present 2 websites are not opening. When I am trying to open these sites either "problem loading page or the website you are looking is not present". These two messages are being displayed.

Try clearing your browser cache.
Tools > Clear Recent History... - hit Details and make sure only Cache is selected, then select Everything and hit the Clear Now button.

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

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

I keep getting a message that Firefox is open and not responding. That I have to close the Firefox application or restart my computer. A real pain. Why is the firefox application not closing in English

I keep getting a message that Firefox is open and not responding. That I have to close the Firefox application or restart my computer. A real pain. Why is the firefox application not closing.

Sounds like Firefox is "hanging at exit". That problem is frequently caused by an Extension or a Plugin. Read all of the following articles.<br /><br />
NOTE: Establish a habit of exiting/closing Firefox with Firefox button > Exit or File > Exit to allow an orderly shutdown of Firefox and closing of all of the files that Firefox has open.
#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.org/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.org/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 an Extension or Plugin causing the problem
#*See:
#**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
#**[http://support.mozilla.org/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.org/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.org/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.'''
Not related to your question, but...
You may need to update some plug-ins. Check your plug-ins and update as necessary:
*Plug-in check --> http://www.mozilla.org/en-US/plugincheck/
*Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.org/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox]
*Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.org/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
*'''''Shockwave Flash''''' (Adobe Flash or Flash): [https://support.mozilla.org/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox]
*'''''Next Generation Java Plug-in for Mozilla browsers''''': [https://support.mozilla.org/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

Computer says firefox is open but cant be found so I have to close computer and start over. computer says firefox is open but not responding

computer on,icons showing,open firefox and I get a firefox is open but not responding.Computer tells me to close computer programs and restart. when I go to close, no programs are open. I hit cancel on shutting down and go back to firefox icon and It opens.

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 [https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems?esab=a&s=troubleshooting&r=3&as=s#w_5-reinstall-firefox here].
<b>WARNING:</b> Do not run Firefox's uninstaller or use a third party remover as part of this process, because that could permanently delete your Firefox data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. <u>These cannot be recovered unless they have been backed up to an external device!</u>
Please report back to see if this helped you!
Thank you.

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?

How do I fix Mountain Lion issue after login where Keychain Access attempts to open, hanging up with "application not responding" message?

How do I fix Mountain Lion issue after login where Keychain Access attempts to open, hanging up with "application not responding" message?

You could try booting into Safe Mode to see if that will help. And "Repair Permissions" in Disk Utility.
Have you got Keychain set to open on Login or is it attempting to open on it's own.

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

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]]

Firefox hangs on open wirh Not Responding

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