Firefox crashes when closing a tab

Well, the title says it all.
I don't know if it is coming from the addons or Firefox itself. If you have two tabs and if you close one of the tabs. It freezes and it will say not responding. Eventually, it will close the tab.

Actually, never mind. I got this fixed. Apparently, MSN Toolbar is the issue. I uninstalled it from my computer and it is working fine. Thanks, anyway.

Similar Messages

Firefox crashing when closing tab -- no Norton

I've got an old version of Firefox, as it's the only version that works in tandem with Greasemonkey for a script I need for work. I've never had any problems with it, and I've been using it for years.
All of a sudden, the last few days, Firefox crashes whenever I close the tab that my Greasemonkey script opens. This tab is just a simple local file, a flash alert beep that opens. When I close it, Firefox crashes. It's never done this before. I've had this version of Firefox on my computer for years, as I said, and it's only recently that this has started to happen.
I don't have Norton antivirus. I have Avast. I have disabled Avast's Web Reputation Plugin, in case it was that, but that didn't help.
Firefox 3.0.19 (Yes, it's an old build, but, again, as I said, I have had no problems with it.)
Windows 7 SP1 (32 bit)
Here's a crash report: https://crash-stats.mozilla.com/report/index/9f9c4b22-7e67-4ce7-aec9-cf3792130327
Here's the output from Firefox's crash window:
Add-ons: {b9db16a4-6edc-47ec-a1f4-b86292ed211d}:4.9.9,{3112ca9c-de6d-4884-a869-9855de68056c}:7.1.20110512W,{e4a8a97b-f2ed-450b-b12d-ee082ba24781}:0.8.20090123.1,{CAFEEFAC-0016-0000-0022-ABCDEFFEDCBA}:6.0.22,{CAFEEFAC-0016-0000-0023-ABCDEFFEDCBA}:6.0.23,{CAFEEFAC-0016-0000-0024-ABCDEFFEDCBA}:6.0.24,{CAFEEFAC-0016-0000-0026-ABCDEFFEDCBA}:6.0.26,{972ce4c6-7e08-4474-a285-3208198ce6fd}:3.0.19
BuildID: 2010031422
CrashTime: 1364405012
InstallTime: 1281969785
ProductName: Firefox
SecondsSinceLastCrash: 703
StartupTime: 1364404319
Theme: classic/1.0
Vendor: Mozilla
Version: 3.0.19
Would appreciate your help. Thanks.

Hi, ideato. Thanks. I have tried updating before, but unfortunately any FF version beyond 3.x.x breaks my Greasemonkey script. And I know what you're saying, that my version is old, but the point is, it's been working perfectly on my machine for years. This problem has suddenly just appeared recently. So it isn't some old, unsupported bug, but a recent issue on my machine that I can't figure out.
If I could just know from the crash report if there's some conflict or the like that's causing this, then I could uninstall the offending program/process/add-on.

Firefox crashing when closing and at other random times

Hi - I'm running firefox 6.0.2 on a Win7 64-bit machine that my cowowker uses. Starting a day or two ago, FF began crashing instead of starting. I can start it in Safe Mode, and I believe I've removed all the add-ons. When in safe mode I can use FF, but it still crashes occasionally, especially if I'm trying to open something in another tab or window. Also, it crashes when I click the X; at least, it shuts down and then the crash reporter pops up. Windows is updated, and I'm stumped. Hope someone can help! Here's the crash report on one of the crash-on-X-click events.
~~~~~
AdapterDeviceID: 0046
AdapterVendorID: 8086
Add-ons: {4ED1F68A-5463-4931-9384-8FFF5ED91D92}:3.4.0,{972ce4c6-7e08-4474-a285-3208198ce6fd}:6.0.2
AvailableVirtualMemory: 4114206720
BuildID: 20110902133214
CrashTime: 1315582016
EMCheckCompatibility: true
FramePoisonBase: 00000000f0de0000
FramePoisonSize: 65536
InstallTime: 1315414618
Notes: AdapterVendorID: 8086, AdapterDeviceID: 0046, AdapterDriverVersion: 8.15.10.1986
ProductName: Firefox
ReleaseChannel: release
SecondsSinceLastCrash: 33
StartupTime: 1315582007
SystemMemoryUsePercentage: 44
Theme: classic/1.0
Throttleable: 1
TotalVirtualMemory: 4294836224
URL: jar:file:///C:/Program%20Files%20(x86)/Mozilla%20Firefox/omni.jar!/chrome/browser/content/browser/aboutHome.xhtml
Vendor: Mozilla
Version: 6.0.2
Winsock_LSP: MSAFD Tcpip [TCP/IP] : 2 : 1 :
MSAFD Tcpip [UDP/IP] : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [RAW/IP] : 2 : 3 :
MSAFD Tcpip [TCP/IPv6] : 2 : 1 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [UDP/IPv6] : 2 : 2 :
MSAFD Tcpip [RAW/IPv6] : 2 : 3 : %SystemRoot%\system32\mswsock.dll
RSVP TCPv6 Service Provider : 2 : 1 :
RSVP TCP Service Provider : 2 : 1 : %SystemRoot%\system32\mswsock.dll
RSVP UDPv6 Service Provider : 2 : 2 :
RSVP UDP Service Provider : 2 : 2 : %SystemRoot%\system32\mswsock.dll
This report also contains technical information about the state of the application when it crashed.

The message to restart your computer, in multiple languages, is a kernel panic. This is usually, but not always, caused by hardware, with memory being the leading cause.
You might want to run the Apple hardware test, which is on the original gray-faced OS X disks that came with the mini. FInd the one that says 'AHT Version x.x' in small print on the label, insert and reboot holding the alt/option key down. Choose the Apple hardware test, and when prompted, choose the extended test. You can also download Rember from http://kelleycomputing.net/rember/ if you want to really test the memory. Set it up and let it run over night.
See this kernel panic FAQs for other ideas: http://www.thexlab.com/faqs/kernelpanics.html

Firefox crashes when using multiply tabs

When using multiply tabs Firefox crashes I get the not responding message and something to do with a script error etc. Is there anything I can do

can you check this issue on Firefox 9?
* getfirefox.com

Firefox crashes when opening new tab

Crash-ID: bp-681f1751-fc5b-4f14-a30b-f93ed2150407
I have tryed:
Clean install (with removing of C:prog..\mozilla)
Uninstalling and deleting extensions
Restarted Firefox in safe mode without addons/extensions.
Uninstalling/updating flash/adobe
I can start firefox, but when i press the "+" to open a new tab Firefox closes and "Mozilla Crash-report" window opens.
It seems like firefox it self can open a tab. For example when i do a fresh installation, Firefox opens with 2 tabs.
But when i want to open one it fails and Firefox shuts down. Its really wierd because i have never run in to this kind of problem before and i dont recall installing anything new before this problem showed up.

''avfallskvarn [[#question-1056211|said]]''
<blockquote>
Crash-ID: bp-681f1751-fc5b-4f14-a30b-f93ed2150407
I have tryed:
Clean install (with removing of C:prog..\mozilla)
Uninstalling and deleting extensions
Restarted Firefox in safe mode without addons/extensions.
Uninstalling/updating flash/adobe
I can start firefox, but when i press the "+" to open a new tab Firefox closes and "Mozilla Crash-report" window opens.
It seems like firefox it self can open a tab. For example when i do a fresh installation, Firefox opens with 2 tabs.
But when i want to open one it fails and Firefox shuts down. Its really wierd because i have never run in to this kind of problem before and i dont recall installing anything new before this problem showed up.
</blockquote>
''cor-el [[#answer-714817|said]]''
<blockquote>
What is the setting of the new tab page?
You can check the browser.newtab.url pref on the about:config page.
You can open the about:config page via the location/address bar.
You can accept the warning and click "I'll be careful" to continue.
*http://kb.mozillazine.org/about:config
See this article about the New Tab page (about:newtab):
*https://support.mozilla.org/kb/new-tab-page-show-hide-and-customize-top-sites
</blockquote>
Thx! For some reason the string was set to "about:newtab" or something like that. Changed the name to my default homepage and the problem was fixed. Any ideas on why this happend? I didn't change it myself.
Never the less! Thank you for saving my haircolour from turning gray of frustration. Was worried i had to turn to Chrome or.... IE....

Firefox crashes when closing, also sometimes after extended use

As noted in the subject line of this message, Firefox has been crashing when I close it, and even sometimes (less regularly) in the middle of a session. I get the request to submit information to Mozilla, which I submit each time. The crash report signature is UserCallWinProcCheckWow. In order to try to fix the problem, I've searched for related topics on this forum, which has led me to open FF in safe mode (it didn't crash) and to disable all add-ons in normal mode (it still crashed when I shut it down). I also tried using the default theme but it still crashed. I'm on a laptop using Windows 7. I'm at a loss as to what to do next to fix this problem. Thank you for any ideas!
== Crash ID(s) ==
ID: 0ee14a83-a10d-4146-aa69-834332100511

iGennie Tech guys can resolve nearly all of the crashing issues of Mozilla Firefox by restarting Mozilla Firefox in safe mode. Begin firefox in safe mode and try once more. If it works, it's absolutely an add-on.
It offers best computer support services.
We wish this information will help you.
for more information you must visit
'''http://www.igennie.net/mozilla-browser-support.html'''

Firefox crashes when closing open windows

Hi
Since updating to the new Firefox 18.0.1 every time I try to close a few open windows Firefox crashes. I would be reading my mail and after having about 10 open windows I go and check on the X to close the windows. I can close about five to seven of them with no problem but when I have about three of them left Firefox crashes. It is very annoying. I used the Firefox Safe Mode feature and this problem does not happen while in Safe Mode. I don't know what the next step is to fix this problem. Could you please help. Thank you

Hello,
Thanks for responding back. Norton is to release an update shortly to fix this crashing issue.
Have a nice day!

Firefox crashes when closing.

From latest crash report
* Crash Reason: EXCEPTION_ACCESS_VIOLATION_EXEC
Started after latest two updates (15.0.1).

That is a problem with the Flash plugin.
You can check for problems caused by recent Flash updates and try these:
*disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer
*disable protected mode in Flash 11.3 and later
*disable hardware acceleration in the Flash plugin
*downgrade to Flash 11.2 or 10.3
*http://kb.mozillazine.org/Flash#Flash_Player_11.3_Protected_Mode_-_Windows
*https://support.mozilla.org/kb/flash-113-doesnt-load-video-firefox
*https://support.mozilla.org/kb/flash-113-crashes

Firefox won't load homepage when launched and crashes when closed.

Last night, while I was in Firefox, a notification popped up that updater.exe had been downloaded. I could easily take a guess: a new version of Firefox was out. I closed Firefox and then had the updater do its thing.
When Firefox then launched & came up with a blank screen (like what you would see with New Tab), I was a little confused. I checked Tools > Options and the general tab was still set to show the homepage when Firefox starts up (Xfinity). I also went through all the other tabs and found that nothing had been changed. It was 18.0, as shown in "About Firefox" so I was scratching my head as to what was going on. Humoring myself, I clicked the "home" Icon, and sure enough it toop me to my homepage. Figuring I'd take a shot at it later, I closed Firefox (The red X in the upper right).
Then things took a stranger turn. Upon closing, the Mozilla Crash Report screen popped up. I figured this was a one-time thing, so I didn't send a report. I launched Firefox again, and again I got a blank screen. Upon closing, the Crash Report screen popped up again. To ensure this was just something with Firefox, I launched Internet Explorer. It showed the homepage upon launch, and didn't crash when closed.
Now, upon getting the troubleshoot information, I discovered another twist: When I go to close one of the tabs, Forefox crashes.
This has me scratching my head. Before I updated, everything was perfectly fine. Now I run into this. Any thoughts?

Alright, I just tried to reset (help > Troubleshooting > click 'Reset Firefox'. It said it would try to hold onto bookmarks, passwords, etc). When it closes, we hit the Crash Report screen again. Launching Firefox reveals nothing has changed (Theme being the same is the give-away). I'd say that hasn't worked as of yet.
I typed about:crashes and copy/pasted everything in the "details" tab. If the "Raw Dump" tab would be more effective, just say so and I'll add that
Signature coffplgn.dll@0x3714
UUID 89ad14cd-e4c9-43d9-9ba0-fa8332130111
Date Processed 2013-01-11 08:26:27
Uptime 27
Last Crash more than 3 months before submission
Install Age 27 seconds since version was first installed.
Install Time 2013-01-11 08:25:31
Product Firefox
Version 18.0
Build ID 20130104151925
Release Channel release
OS Windows NT
OS Version 5.1.2600 Service Pack 3
Build Architecture x86
Build Architecture Info AuthenticAMD family 16 model 2 stepping 3
Crash Reason EXCEPTION_ACCESS_VIOLATION_EXEC
Crash Address 0x54d7048
User Comments
App Notes
AdapterVendorID: 0x1002, AdapterDeviceID: 0x9611, AdapterSubsysID: 00000000, AdapterDriverVersion: 8.531.0.0
D3D10 Layers? D3D10 Layers- D3D9 Layers? D3D9 Layers-
Processor Notes
EMCheckCompatibility True
Winsock LSP
MSAFD Tcpip [TCP/IP] : 2 : 1 :
MSAFD Tcpip [UDP/IP] : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [RAW/IP] : 2 : 3 : %SystemRoot%\system32\mswsock.dll
RSVP UDP Service Provider : 6 : 2 : %SystemRoot%\system32\rsvpsp.dll
RSVP TCP Service Provider : 6 : 1 : %SystemRoot%\system32\rsvpsp.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{0BBE6F70-6FFF-4959-B762-459BA69AE89C}] SEQPACKET 4 : 2 : 5 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{0BBE6F70-6FFF-4959-B762-459BA69AE89C}] DATAGRAM 4 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{CA2BB869-E7F7-405E-9266-0E2BDF8F748D}] SEQPACKET 1 : 2 : 5 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{CA2BB869-E7F7-405E-9266-0E2BDF8F748D}] DATAGRAM 1 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{2FAAFBE0-C5F0-46B6-A02A-3B87402292F7}] SEQPACKET 2 : 2 : 5 : %SystemRoot%\system32\mswsock.dll
MSAFD NetBIOS [\Device\NetBT_Tcpip_{2FAAFBE0-C5F0-46B6-A02A-3B87402292F7}] DATAGRAM 2 : 2 : 2 : %SystemRoot%\system32\mswsock.dll
Adapter Vendor ID 0x1002
Adapter Device ID 0x9611
Total Virtual Memory 2147352576
Available Virtual Memory 1770160128
System Memory Use Percentage 29
Available Page File 4371468288
Available Physical Memory 2476265472
Bugzilla - Report this bug in Firefox, Core, Plug-Ins, or Toolkit
Related Bugs
783369 NEW --- Norton Confidential 2012/2013 crashes (couictlr.dll, coffplgn.dll)
Crashing Thread
Frame Module Signature Source
0 @0x54d7048
1 coFFPlgn.dll coFFPlgn.dll@0x3714
2 couictlr.dll couictlr.dll@0x28355
3 couictlr.dll couictlr.dll@0x3dcec
4 couictlr.dll couictlr.dll@0x35609
5 couictlr.dll couictlr.dll@0xbe7f
6 oleaut32.dll APP_DATA::AllocCachedMem
7 couictlr.dll couictlr.dll@0x6106b
8 coFFPlgn.dll coFFPlgn.dll@0x590e7
9 coFFPlgn.dll coFFPlgn.dll@0xa812b
10 coFFPlgn.dll coFFPlgn.dll@0x51748
11 coFFPlgn.dll coFFPlgn.dll@0x2bec
12 coFFPlgn.dll coFFPlgn.dll@0x4ef66
13 coFFPlgn.dll coFFPlgn.dll@0xb335b
14 coFFPlgn.dll coFFPlgn.dll@0xc753f
15 coFFPlgn.dll coFFPlgn.dll@0x3c5a3
16 coFFPlgn.dll coFFPlgn.dll@0xa7b00
17 coFFPlgn.dll coFFPlgn.dll@0xa522
18 coFFPlgn.dll coFFPlgn.dll@0xc6fe
19 coFFPlgn.dll coFFPlgn.dll@0x2a908
20 coFFPlgn.dll coFFPlgn.dll@0xc8813
21 coFFPlgn.dll coFFPlgn.dll@0xa9e51
22 coFFPlgn.dll coFFPlgn.dll@0x2a346
23 coFFPlgn.dll coFFPlgn.dll@0xaa35b
24 xul.dll nsObserverService::NotifyObservers xpcom/ds/nsObserverService.cpp:149
25 xul.dll nsCOMPtr_base::assign_from_qi obj-firefox/xpcom/build/nsCOMPtr.cpp:56
26 xul.dll xul.dll@0xebfe67
27 @0x12c713
28 xul.dll nsWindowWatcher::RemoveWindow embedding/components/windowwatcher/src/nsWindowWatcher.cpp:1221
29 xul.dll nsAppShellService::UnregisterTopLevelWindow xpfe/appshell/src/nsAppShellService.cpp:525
30 xul.dll nsTimerImpl::Release xpcom/threads/nsTimerImpl.cpp:138
31 xul.dll nsWebShellWindow::Destroy xpfe/appshell/src/nsWebShellWindow.cpp:758
Show/hide other threads

Even after enabling "Warn me when closing multiple tabs", firefox closes without any warning even if multiple tabs are open.

I recently installed Firefox 4.0 and in the options, under the section "Tabs", I have enabled "Warn me when closing multiple tabs". But if I have multiple tabs opened with websites loaded in them, and then try to close the browser, it simply closes. No warnings are shown (which was there in previous versions). Couple of times I clicked on the close button of browser and then realized that I had some important sites opened in different tabs, which I lost as it didn't warn me. Can you please let me know whether this is a bug or a mistake from my side?

I'm sure you are using Private Browsing mode in Firefox 4. I have also the same problem and I tried to uncheck this option after many times accessing about:config\browser.warnOnquit. And it's wonderful, the warning cameback. I think it's a bug about Private Browsing mode. Hope Mozilla's Developers will fix it.

Firefox crashing when i wanna open or close a tab or a window, also while wanna open any page, now what to do for solving the problem?

Firefox crashing when i wanna open or close a tab or a window, also while wanna open any page, now what to do for solving the problem?

Disable McAfee siteadvisor and check the problem still persist or not?

Firefox 25.0.1 Warn when closing multiple tabs (on) conflicts with "show windows und tabs from last time" (on); need both, but only one or the other works.

Using Firefox 25.0.1 on Windows 7 Home Premium
I've poured through support forums for Mozilla Firefox searching for a fix to my initial problem of the "Warn when closing multiple tabs" pop up not popping up when I have it selected.
Went through About:Config, making sure warnings for tabs und closing, und showing on quit, und quitting, etc. were all set to true, which were "possible" fixes for the issue I was having, there are like five or six things set to true for warnings/quitting/etc. No avail. They are all set to true.
Then I stumbled across one that suggested a conflict with the "Warn When Closing Multiple Tabs" und the "Show Windows und Tabs from last time".
I use both features. However, I found if I want the warning pop up for closing multiple tabs, I have to have "show homepage" or "show blank page" selected instead of "Show windows und tabs from last time" selected. (Tools>Options>General>Start Up>When Firefox Starts:) The problem with this is, yes, I get my warning pop up, BUT, I don't get my tabs from my last session.
The warning in settings (Tools>Options>Tabs>Warn Me When Closing Multiple Tabs) is checked.
To have my tabs restored from last session, I simply select it for "when firefox starts". Bam, I have my tabs that were open from the last time I quit. Und again, full circle, I don't have my warning pop up.
There were also suggestions of the warning on close for tabs is conflicting with add-ons.
However, I don't have many. Und I have yet to test them to see if they interfere. These are according to my Add Ons tab when I check it myself.
Extensions:
1. Avast WebRep (disabled)
2. HP Smart Web Printing (disabled)
Plugins:
1. Adobe Acrobat
2. Google Update
3. iTunes Application Detector
4. Java (TM) Platform SE 7 U45
5. Shockwave Flash
6. Shockwave For Director
7. Silverlight Plug-In
8. VLC Web Plugin
9. Windows Live Photo Gallery
10. Java Deployment Toolkit (disabled)
Note: The Details Firefox provides says I have these for Plugins
* Shockwave Flash 11.9 r900
* Adobe Shockwave for Director Netscape plug-in, version 12.0.5.146
* Next Generation Java Plug-in 10.45.2 for Mozilla browsers
* Google Update
* Adobe PDF Plug-In For Firefox and Netscape 11.0.05
* VLC media player Web Plugin 2.1.0
* 5.1.20913.0
* iTunes Detector Plug-in
* NPWLPG
Unsure of what the "5.1.20913.0" und the "NPWLPG" plugins are, but they don't appear to me under Add Ons.
Und as usual, I'm assuming the solution lies within About:Config, I will show here now what I have set to True.
browser.tabs.warnOnClose - True
browser.tabs.warnOnCloseOtherTabs - True
browser.tabs.warnOnOpen - True
browser.warnOnQuit - True
browser.showQuitWarning - True
As aforementioned:
The seemingly only issue is the conflict between Show Windows/Tabs From Last Time und the Warn On Quit pop up. Und again, I need/want both of them. More so the tabs from the last session, but I really really really really really want the warning.
So, if anyone knows a work around, preferably without having to download anything to fix this, I would be extremely grateful.

You mention a second subject.
''I'm probably going to downgrade to another version of firefox that was suggested to me since I'm also having issues with shockwave flash causing firefox to hang und ultimately needs to be force closed otherwise having to have flash disabled to use firefox.''
Downgrading Firefox 
Flash is notorious for causing Firefox problems. I suggest you start a new thread about that. If at all possible you should try to avoid downgrading to an unsecure & unsupported version of Firefox. it will increase risks to your system and Personal data. (There are methods of mitigating the risks, using a virtual machine or operating within a secure intranet for instance)
*(Do Not) [[Install an older version of Firefox]]
Try Flash with Protected Mode Off 
Worth a try as it takes minimal effort & often solves Flash Problems whilst allowing current and more secure FlashPlayer to be used. See
* http://kb.mozillazine.org/Flash#Flash_Player_11.3_Protected_Mode_-_Windows
* http://forums.adobe.com/thread/1018071#TemporaryWorkaround
If you wish to pursue these subjects further I note you have already started a thread you may as well continue the discussion in that thread, but also post back here so we can follow both.
* ''Firefox is having "Script" issues (Not Responding) und possibly Flash issues?'' [/questions/978181]
** try ensuring you close down Firefox using the menu, that may even help with Flash problems.
Your experience in submitting troubleshooting information on the forum 
(This is out of curiosity, but with the intention of pressing for changes if forum faults are discovered.)
There are yet more changes to this forum underway. Mozilla recently tried to improve the experience for first time users of the forum and a troubleshooting app option was included in the workflow to try to encourage users to submit full troubleshooting information.
I would be interested to know what you thought
I sometimes wonder if users are not trying to use that, or whether forum users run into problems in using it. At one point I wondered whether there was a problem if too much data was included but never actually proved that conjecture.
Assuming you are using the forum, and not merely replying by email look towards the top in the right hand margin for clickable buttons
* Question Details -V- More System Details -> [Additional System Details]
You will note that includes only partial information. There are no changed prefs or extensions listed. Compare for instance the information in this thread [/questions/978130] with full information.
I believe your mystery plugins are Windows related
* NPWLPG relates usually to Windows Live Photo Gallery
* 5.1.20913.0 will be Silverlight

Firefox 17.0 doesn't warn me when closing multiple tabs any more

hi all
Having updated to Firefox 17.0 (from 16.0.2), for some reason I don't get warned when closing multiple tabs any more.
I've confirmed the relevant options are selected and am 100% certain this was working fine before updating Firefox today.
I've replicated the problem on my vista 32bit platform and on XP 32 bit too.
I also looked at the changelog for Firefox 17 but can't see any explanation for this change in behaviour, although I wonder whether this might have something to do with it "772319 No option to disable the "Close other tabs" prompt."
As I use Tab Mix Plus (add-on), I've also checked Firefox in safemode and have found the native tab warnings not working, so have concluded it's an issue with Firefox (rather than something to do with an extension).
I've checked "about:config" and "browser.tabs.warnOnClose" is set to true, as is "browser.tabs.warnOnCloseOtherTabs".
Any help would be appreciated.
Thanks,
Gary

I have this problem too. i have tab mix plus but in my case browser.tabs.warnOnCloseOtherTabs and browser.tabs.warnOnClose are both set to true but i still get no warnings which sucks because i accidently click on close alot.

Firefox warns always when closing multiple tabs, even when respective setting is cleared

Firefox warns always when closing multiple tabs, even when respective setting is cleared. "browser.tabs.warnOnClose" (and "browser.tabs.warnOnCloseOtherTabs" too) are in "false" state. The same behaviour after reset. Firefox 32.0.3, OS - Linux Mint 17.

Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Firefox 11 does not warn me when closing multiple tabs. How do I do this?

(Tools/options/tabs tab/ warn me when closing multiple tabs) How can I get this to work so I can set it once and keep the warning in different sessions.
(Other replies seem to indicate it has to be done through config for each session)
Thanks Alf
OS XP Pro sp3
Firefox v11

Hi AlfLinus,
You should only have to set it once. Does the actual checkbox disappear when you open a new session? You should look at the article [[Preferences are not saved]]. Firefox might be having trouble writing to your pref.js file.
Hopefully this helps!

Firefox crashes when closing a tab

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