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Firefox crashes on close

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I use Firefox as my default browser on two computers, a workstation running Windows 7x64 and a laptop running Windows 8.1x64. (Yes, I'm aware Microsoft is discontinuing support for Windows 7 in January.) I have the current version of Firefox (71.0 64-bit) on both computers, and keep both Windows and Firefox up to date.

Every time I close Firefox on either computer, I get a Windows error saying "Firefox has stopped working" and asking if I want to check online for a solution or just close the program. The strangest thing is that, when I close that window, another one just like it pops up and have to close it a second time. I do not get the Mozilla Crash Reporter. edited to remove horizontal scrollbar. aw

I've tried some of the solutions suggested in other posts (e.g. adjusting my settings around history/clearing data on close, refreshing Firefox, etc.) - sometimes it solves the problem for the next time I open Firefox, but the problem always reoccurs almost immediately. This has been happening for years (including older versions of Firefox on previous computers) - I switched to Chrome for several years because of it, but am back because privacy concerns and have been putting up with the annoyance for several years.

Here are the "problem details" from the last time I closed Firefox on the Windows 7 computer (I'm writing this question on the Win8.1 computer):

1st error message includes the following details:

Problem signature:

 Problem Event Name:	APPCRASH
 Application Name:	firefox.exe
 Application Version:	71.0.0.7275
 Application Timestamp:	5de4f320
 Fault Module Name:	lastapphook_x64.dll
 Fault Module Version:	1.0.0.1
 Fault Module Timestamp:	576c3e9d
 Exception Code:	c0000005
 Exception Offset:	00000000000041b3
 OS Version:	6.1.7601.2.1.0.256.48
 Locale ID:	1033
 Additional Information 1:	bf32
 Additional Information 2:	bf32440c9b0b42cd3787c1892200b316
 Additional Information 3:	2ce3
 Additional Information 4:	2ce39d4b466181c702eb3da8cbce4286

Read our privacy statement online:

 http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409

If the online privacy statement is not available, please read our privacy statement offline:

 C:\windows\system32\en-US\erofflps.txt


2nd error message includes the following details:

Problem signature:

 Problem Event Name:	APPCRASH
 Application Name:	firefox.exe
 Application Version:	71.0.0.7275
 Application Timestamp:	5de4f320
 Fault Module Name:	lastapphook_x64.dll
 Fault Module Version:	1.0.0.1
 Fault Module Timestamp:	576c3e9d
 Exception Code:	c000041d
 Exception Offset:	00000000000041b3
 OS Version:	6.1.7601.2.1.0.256.48
 Locale ID:	1033
 Additional Information 1:	db0d
 Additional Information 2:	db0d11486f3dbacbe864069b9c5a0475
 Additional Information 3:	5de1
 Additional Information 4:	5de15e941ffc95b29af416ed3c74edbb

Read our privacy statement online:

 http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409

If the online privacy statement is not available, please read our privacy statement offline:

 C:\windows\system32\en-US\erofflps.txt


Anyone have any ideas? Happy to provide additional information if requested. Thanks in advance for any assistance.

Thanks, John B.

I use Firefox as my default browser on two computers, a workstation running Windows 7x64 and a laptop running Windows 8.1x64. (Yes, I'm aware Microsoft is discontinuing support for Windows 7 in January.) I have the current version of Firefox (71.0 64-bit) on both computers, and keep both Windows and Firefox up to date. Every time I close Firefox on either computer, I get a Windows error saying "Firefox has stopped working" and asking if I want to check online for a solution or just close the program. The strangest thing is that, when I close that window, another one just like it pops up and have to close it a second time. I do not get the Mozilla Crash Reporter. <sub> edited to remove horizontal scrollbar. aw</sub> I've tried some of the solutions suggested in other posts (e.g. adjusting my settings around history/clearing data on close, refreshing Firefox, etc.) - sometimes it solves the problem for the next time I open Firefox, but the problem always reoccurs almost immediately. This has been happening for years (including older versions of Firefox on previous computers) - I switched to Chrome for several years because of it, but am back because privacy concerns and have been putting up with the annoyance for several years. Here are the "problem details" from the last time I closed Firefox on the Windows 7 computer (I'm writing this question on the Win8.1 computer): 1st error message includes the following details: Problem signature: Problem Event Name: APPCRASH Application Name: firefox.exe Application Version: 71.0.0.7275 Application Timestamp: 5de4f320 Fault Module Name: lastapphook_x64.dll Fault Module Version: 1.0.0.1 Fault Module Timestamp: 576c3e9d Exception Code: c0000005 Exception Offset: 00000000000041b3 OS Version: 6.1.7601.2.1.0.256.48 Locale ID: 1033 Additional Information 1: bf32 Additional Information 2: bf32440c9b0b42cd3787c1892200b316 Additional Information 3: 2ce3 Additional Information 4: 2ce39d4b466181c702eb3da8cbce4286 Read our privacy statement online: http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409 If the online privacy statement is not available, please read our privacy statement offline: C:\windows\system32\en-US\erofflps.txt 2nd error message includes the following details: Problem signature: Problem Event Name: APPCRASH Application Name: firefox.exe Application Version: 71.0.0.7275 Application Timestamp: 5de4f320 Fault Module Name: lastapphook_x64.dll Fault Module Version: 1.0.0.1 Fault Module Timestamp: 576c3e9d Exception Code: c000041d Exception Offset: 00000000000041b3 OS Version: 6.1.7601.2.1.0.256.48 Locale ID: 1033 Additional Information 1: db0d Additional Information 2: db0d11486f3dbacbe864069b9c5a0475 Additional Information 3: 5de1 Additional Information 4: 5de15e941ffc95b29af416ed3c74edbb Read our privacy statement online: http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409 If the online privacy statement is not available, please read our privacy statement offline: C:\windows\system32\en-US\erofflps.txt Anyone have any ideas? Happy to provide additional information if requested. Thanks in advance for any assistance. Thanks, John B.

Modified by AliceWyman

Chosen solution

Hi Philipp, Thank you very much. I was suspicious of LastPass but had refreshed Firefox, which uninstalls the LastPass browser extension, and still had the problem. However, in following the link you shared, it appears the problem is caused by LastPass for Applications, a related desktop app for logging into other apps that require passwords (e.g. Quickbooks), rather than the LastPass browser extension. I can't find the setting they mention in the current version of LastPass for Applications but I just uninstalled it and the Firefox problem went away. I can't believe I put up with this problem for so long without posting in the forums.

Thanks again, John

edited to remove horizontal scrollbar. aw

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Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • User Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:71.0) Gecko/20100101 Firefox/71.0

More Information

philipp
  • Top 25 Contributor
  • Moderator
5346 solutions 23603 answers

Helpful Reply

hi, this seems to be caused by the 3rd-party lastapphook_x64.dll file that's injected into firefox and apparently is related to lastpass. you could try if the solution provided at https://forums.lastpass.com/viewtopic.php?f=12&t=271305 works for you too...

hi, this seems to be caused by the 3rd-party lastapphook_x64.dll file that's injected into firefox and apparently is related to lastpass. you could try if the solution provided at https://forums.lastpass.com/viewtopic.php?f=12&t=271305 works for you too...
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Chosen Solution

Hi Philipp, Thank you very much. I was suspicious of LastPass but had refreshed Firefox, which uninstalls the LastPass browser extension, and still had the problem. However, in following the link you shared, it appears the problem is caused by LastPass for Applications, a related desktop app for logging into other apps that require passwords (e.g. Quickbooks), rather than the LastPass browser extension. I can't find the setting they mention in the current version of LastPass for Applications but I just uninstalled it and the Firefox problem went away. I can't believe I put up with this problem for so long without posting in the forums.

Thanks again, John

edited to remove horizontal scrollbar. aw

Hi Philipp, Thank you very much. I was suspicious of LastPass but had refreshed Firefox, which uninstalls the LastPass browser extension, and still had the problem. However, in following the link you shared, it appears the problem is caused by LastPass for Applications, a related desktop app for logging into other apps that require passwords (e.g. Quickbooks), rather than the LastPass browser extension. I can't find the setting they mention in the current version of LastPass for Applications but I just uninstalled it and the Firefox problem went away. I can't believe I put up with this problem for so long without posting in the forums. Thanks again, John <sub>edited to remove horizontal scrollbar. aw</sub>

Modified by AliceWyman

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