Firefox hangs and not responding

I am having this problem since last week, firefox has become slow and not responding. I have reseted it to the original, changed a file to places.sqlite.old (as suggested in the homepage of support page), unchecked the hardware accelaration, disabled plugins, etc. I have tried almost everything i could find on the net. The problem is very apparent when scrolling down Facebook pages, switching tabs, lags when typing and playing videos. Please email me suggestions at [email protected] ''(email removed - c)''

Hello,
'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* On Windows you can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac you can open Firefox 4.0+ in Safe Mode by holding the '''option''' key while starting Firefox.
* On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
[[Image:FirefoxSafeMode|width=520]]
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''
Thank you.

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The download selected responses as PDF is hanging and not responding

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Are the computers all on the same network?
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Why does firefox hang or not respond when I am using disable third party cookies setting

I have, by process of elimination, realized that when using the setting "allow third party cookies - 'never' ", causing my firefox to hang so much that I cannot use it. I have used that setting "allow third party cookies - 'never' ", for as long as it has been available. Over that last few months, I have been having problems with firefox hanging and getting the message "firefox not responding". It became very annoying, causing me to look for a solution. I read through the kb and tried many solutions. I can now say that when I change the cookie settting to "always" the problem goes away. It is helped only slightly by using the "from visited" setting. How can I fix this? I don't want all the cookies but I cannot surf with this problem constantly.

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Firefox hangs, shows Not Responding, on start up and at random times

Firefox is hanging on start up and at random times during use. When I click the desktop icon it takes about 20-30 seconds and then opens the usual Firefox start page. However as soon as I move the mouse or try and use anything on the screen it hangs. The Firefox logo top left in the blue bar turns into a white box. After about 2 minutes it reverts to the Firefox logo and all starts working normally.
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Hey ramjet.
Could you please copy/paste your info from your post to [https://support.mozilla.org/en-US/questions/new questions/new]? That'll help us get specific details about your Firefox configuration so we can assist you one-on-one.
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Flash slows FF with hangs and 'not responding' messages.

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my question is.... is there a way to easily disable/enable flash w/o going into the add-ons manager? Depending on what i'm doing, i'm in add-ons manager to either enable it when i need it or to disable it when firefox is slow and hangs.
I've gotten to the point where i just open add-ons manager in a tab and leave it open because i know i'll probably be in there turning flash on or off depending on how its effecting my machine.
Also, i tried running flash in 'ask to activate' mode, but you have to reload the page so it can find the add-on.
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Hi Duke, your bookmarks and other Firefox data actually are in the C:\Users folder so it's safe to delete the folder under C:\Program Files (or C:\Program Files (x86) on 64-bit systems).
When you run the installer again, it should detect and use your previous settings folder. To get a clean start on that as well, you can:
'''Create a new Firefox profile'''
A new profile will have your system-installed plugins (e.g., Flash) and extensions (e.g., security suite toolbars), but no themes, other extensions, or other customizations. It also should come with completely fresh settings databases and a fresh cache folder.
''This does not replace your existing setup; the new folder exists in parallel with your current settings.''
Exit Firefox and start up in the Profile Manager using Start > search box (or Run):
firefox.exe -P
''Don't delete anything here.''
Any time you want to switch profiles, exit Firefox and return to this dialog.
Click the Create Profile button, assign a name like March29, and ignore the option to change the folder location. Then start Firefox in the new profile you created.
Does that work any better?
Note: When returning to the Profile Manager to switch back to your normal profile, you might be tempted to use the Delete Profile button. But... it's a bit too easy to accidentally delete your "real" profile, so I recommend resisting the temptation. If you do want to clean up later, I suggest making a backup of all your profiles first in case something were to go wrong.

Why, when using a search engine i.e. Google or Bing does Firefox 'hang' and not allow any input

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Note: This only happens with Firefox, other browsers work fine with these sites.

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Firefox hangs and don't respond

I have Firefox 30.0 , My browser hangs up randomly . I follow all the guides under the https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding but not solve my problem.
Reset Firefox also doesn't help.

Hi avi,
Having more than one version of a plugin installed should not cause a hang, but see if disabling the older one helps.
Adobe PDF Plug-In For Firefox and Netscape 11.0.04
Adobe PDF Plug-In For Firefox and Netscape 10.1.8
Also sorry to hear that resetting the browser does not help. That would rule out addons or changed preferences. To further troubleshoot we can try a Malware scan or if there are consistent steps that cause it to hang. For example is it a start up hang, or does it always happen on a certain website?
Also, please update to the current version 31 :-) there was a hotfix that you may be encountering during the update.
I hope this helps.

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Have you tried a reset ? Press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider if it appears), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.

The "hanging/freezing/not responding" problem that existed in all versions of Firefox 3.6 persists in Firefox 4.0

Starting on April 14, 2011, I tried installing Firefox 4.0, which I downloaded from the Mozilla site. The first couple of times I tried to install it, it corrupted Firefox file places.sqlite. I know this because the install renamed the file to places.sqlite.corrupt. Luckily, I had recent backups. My previous installed versions were 3.5.18, which I had been using up to this time, and 3.6.16. I tried installing 4.0 with 3.6.16 installed, which I installed only for the sake of installing 4.0, and with no previous version installed and got the same bad results. I finally got a "successful" install on April 16, 2011, with no previous version installed.
Early on I discovered that Firefox 4.0 hangs (Firefox not responding) when left to idle for exactly 5 minutes (I timed it several times after immediately starting Firefox), pegging a constant 50% of the CPU when it hangs. I left it in a hanging state for up to half an hour, but nothing changed. This problem existed for all versions of Firefox 3.6, which is why I didn't install version 3.6.16 until I was ready to install version 4.0. I never kept any version of Firefox 3.6 installed for more than a couple of hours because of this problem. I need to be able to let Firefox stay idle for long periods of time -- certainly for more than 4 minutes and 59 seconds -- without having it hang, and I was able to do that with all versions of Firefox prior to version 3.6. It's incomprehensible that Firefox 4.0 has to always hang if it's inactive for more than 4 minutes and 59 seconds, and it's incomprehensible that this problem has been present and persistent since version 3.6 was introduced. To believe that 4 minutes and 59 seconds is sufficient idle time for a browser is absurd. This was never an issue with any version of Firefox prior to version 3.6, this was never an issue with Netscape, and it's not an issue with IE 8.
There are 2 other problems related to the hanging problem. If the browser and the bookmarks library are both open and the browser is closed normally, the bookmarks library remains open. After being left idle for exactly 5 minutes, the bookmarks library hangs, pegging a constant 50% of the CPU. If Firefox 4.0 is restarted before the 5 minute idle limit, it starts successfully. If an attempt is made to restart it after the 5 minute idle limit, it won't start. If the bookmarks library is left open for less than 5 minutes after the browser is closed, it can be closed successfully. In all versions of Firefox prior to version 3.6, the bookmarks library automatically closed when the browser was closed. The other related problem is that Firefox 4.0 occasionally pegs a constant 50% of the CPU without hanging even while it is being used and even if the only thing open is the home page, which in my case is google.com. Firefox can be used while this is happening, but it is worrisome and shouldn't be happening. Normally, Firefox 4.0 uses no CPU when it is left to idle within the 5 minute idle limit.
Firefox 4.0 has not crashed on its own yet, so I've had no crash reports to send to Mozilla, but because I've had to use the "End Now" button on the Microsoft unresponsive program window numerous times to terminate it when it hangs, numerous Microsoft Windows dump reports have been generated, all of which I've sent to Microsoft.
The last fully working version of Firefox I had was 3.5.18. Unfortunately, I don't have the installer for that version and Mozilla doesn't make it available anymore. Also, it looks like version 4.0 altered the places.sqlite file such that I might not be able to go back to version 3.5.18 even if I could. If I could reinstall version 3.5.18 and get it to work with the altered places.sqlite file, I would, but it is outdated and no longer supported by Mozilla, and I only want to use up-to-date and supported software.
The hanging problem is totally intolerable and unacceptable. If I can't get a version of Firefox 4.0 anytime soon that doesn't hang after being idle for just 5 minutes (why 5 minutes???) or for any limited amount of time, I'll have to install and use Google Chrome as a permanent replacement for Firefox. (If I do have to replace Firefox with Google Chrome, how can I get my Mozilla Thunderbird e-mail links to open in Google Chrome when I click on them?) Based on other user feedback regarding this problem dating back to the very first Firefox 3.6 version, Mozilla has had ample time to resolve it. I have found other problems with Firefox 4.0, but I'm not going to bother telling Mozilla about them because if the hanging problem isn't resolved soon, I'll have to stop using Firefox permanently. I can't and won't tolerate the hanging problem. I have been using Firefox exclusively for many years, but my disappointment with it has been growing since version 3.6 was introduced and my patience has run out.
I would appreciate Mozilla letting me know within a week of this posting if they can't or won't fix the Firefox 4.0 hanging problem. If I don't receive a substantive response to this problem within a week, I'm going to have to abandon Firefox permanently and switch to Google Chrome. I'm also going to leave a negative review of Firefox 4.0 on CNET to warn other potential users of the hanging problem.
I am running Windows XP Media Center Edition 32-bit SP3 on a Dell XPS 400 desktop computer. I have an Intel Pentium D CPU 2.80GHz, 3.0GB Dual-Channel DDR2 RAM @ 265MHz, RADEON X300 SE 128MB HyperMemory, and 190GB of free space on my hard drive. I am using COMODO as my firewall and Avira AntiVir as my anti-virus software. I am also using WinPatrol and Secunia PSI. My ISP is AT&T. My download speed averages 2.5 Mbps, and my upload speed averages 0.65 Mbps. All of my software is up to date, thanks to Secunia PSI and CNET TechTracker, and my computer is free from infection.

Another aspect of the Firefox 4.0 "hanging/freezing/not responding" problem has emerged. I have found that on the common occurrence when Firefox 4.0 occasionally pegs a constant 50% of the CPU while idling within the 5 minute idle limit and I close it normally, it disappears from the Task Bar but continues to run and continues to peg a constant 50% of the CPU. I tried restarting Firefox 4.0 and got the following 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." Before Firefox can be restarted, the existing Firefox process must be killed via the Task Manager or Process Explorer (I use the latter), after which a Microsoft Windows dump report is immediately generated. I always allow the dump to be sent to Microsoft.
The three big questions that have gone unanswered by Mozilla are 1) why did the hanging problem start with the very first release of Firefox 3.6, 2) why was the problem allowed to continue on up to and through Firefox 4.0, and 3) why hasn't Mozilla fixed the problem yet? And what is the significance of the 5 minute idle limit? Do Firefox 3.6 through 4.0 try to launch something when the browser and/or the bookmarks library have been idle for exactly 5 minutes? Maybe it's a problem with the number and/or type of plugins and extensions and/or the number of bookmarks. Maybe Firefox 3.6 through 4.0 work just fine if there are few to no plugins, extensions, and bookmarks, but that doesn't realistically accommodate users. Whatever the cause of the problem, Mozilla should have had a handle on it by now.
If anyone from Mozilla Support is reading this post, please let me know if it is possible to roll back Firefox 4.0 to Firefox 3.5.18. If it is possible, how do I do it, and where can I get the installer for Firefox 3.5.18? If I can reinstall it, I'll use it until Secunia Software Inspector informs me that it is insecure and no longer safe to use. At that point (maybe much sooner), I'll switch to Google Chrome exclusively because I don't want to use outdated software that is insecure and because I don't believe that Mozilla intends to fix the hanging problem and is willing to lose users over it. I certainly don't want to use software like Firefox 4.0 that has such an impactful problem. If I do have to abandon Firefox, how can I click on Mozilla Thunderbird e-mail links and get them to open in Google Chrome?

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

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]

Firefox hangs and will not allow me to access other programs running when I resize a pop up window, move a pop up window, accidentally right click flash content.

Firefox hangs and will not allow me to access other programs running when I resize a pop up window, move a pop up window, accidentally right click flash content.
== This happened ==
A few times a week
== Not sure when it statrted

Hi.
When this happens, please press CTRL+SHIFT+ESC and see how much RAM and CPU Firefox is using. If they're sky high, then... Well, that kind of issues are, unfortunately, more common and the we'd like. Thankfully, 99% of the cases are very easy to solve. However, you do need to diagnose what your exact problem is. Do this:
#run Firefox in safe-mode to disable all extensions and plugins. If this fixes your issues, be them with RAM or CPU usage, then you know it's a problem with plugins or extensions. Proceed to number 2. If safe-mode doesn't fix the issues, then read bellow, after this list;
#update all extensions and plugins in your Firefox. If this doesn't solve the issues, proceed to the following number;
#disable all extensions and plugins in your Firefox (not running safe-mode). Being certain that, as in safe-mode, the problems you're having have gone away, enable one plugin at a time. You should be certain that you WANT that plugin to be enabled, so keep your overall number of plugins as low as possible. When you encounter the problems, you know you've found a problematic plugin, so disable it for good. Keep enabling all plugins (except problematic ones) until you've gone through them all.
#enable one extension at a time. Again, be certain that you WANT that extension to be enabled, so keep your overall number of extensions as low as possible. When you encounter the problems, you know you've found a problematic extension, so disable it for good. Keep enabling all your extensions (except problematic ones) until you've gone through them all;
#you're done! You've fixed your problems with problematic add-ons.
Ok, if disabling all extensions and plugins through safe-mode didn't work to bring Firefox's CPU and RAM usage to good levels, then you have different issue. The most likely scenario is that you have a third party software running on your computer that is messing with Firefox. Do as follows:
#do a virus/malware check on your computer. If this doesn't fix it, proceed;
#disable all software running in the background that you don't want to have running in the background (in windows, this is done by pressing WINDOWS+R in your keyboard, typing "msconfig" (without the commas) and pressing enter. Now, under the "Startup" tab, you can uncheck the software you don't want, and reboot your system for changes to take effect. If you're unsure of what software you want running, ask someone with more experience). If this doesn't fix you issues with Firefox, proceed;
#check your firewall/antivirus/security suite for enabled functions/features that you don't want and/or may be conflicting with Firefox. You'll find that these features are most likely tied to Internet Security features, such as link scanners or URL checkers and the like. If you're not sure they are conflicting with Firefox, simply try to disable to see whether or not that's true. As long as you don't browse the web with your antivirus completely off and your firewall completely turned off, there should be no problems. If this doesn't solve the issues, proceed to the following number;
#check your operating system security options, mainly advanced options that are not configured by default. While it's very unlikely that this may be the cause of the problem (after all, it's the last item on the list), it's remotely possible. If this doesn't do it, I'm out of ideas. Except make sure you've followed my instructions correctly.

Slow start up and not responding Firefox 3.6.13

Slow start up and not responding when I open Firefox 3.6.13. As long as 1 minute. I tried in save mode and it doesn't seem to happen. I used McAfee before and now use Norton IS with Real Time Malwarebytes. Still the same speed opening up, so the virus software is not causing the problem I think. I disable a lot of the add-on and still the same problem. Any suggestions?
Vista OS

If other softwares runs fast and smooth it's obvious that it's a Firefox-problem.
Probably because of a corrupt profile.
I have done a "checklist" you could follow here: https://support.mozilla.com/en-US/questions/667207#answer-124643
Regarding slow start up, it's a common and old problem.
Not all FF-users experience it as a problem, but I used to belong to them who suffered.
If your cold start up (the first start after a Windows boot) is really slow, but a warm start (the second time you restart Firefox) is much faster - then I think I can help you.
Try my own simple solution here: https://support.mozilla.com/en-US/questions/762446#answer-119951
I run on Win 7 64-bit and on Firefox 4.0 betas, but that doesn't matter as it works also on older Windows and Firefox versions.
Regarding your anti-virus software. I have tried the most of them. The best tradeoff is in my opinion Eset Smart Security (NOD32).
If you want to try it: http://www.eset.com/download/free-trial/international
I hope this will help you :)

Firefox hangs and not responding

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