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Firefox crashes whenever I try to shut it down, or turn off computer. Now all my saved tabs are gone too.

  • 4 replies
  • 1 has this problem
  • Last reply by cor-el

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I am on an iMac running High Sierra 10.13.6. For the last couple months whenever I try to close Firefox it either crashes or I have to force quit Firefox to make it quit. But on restart tabs have been restored, or I have been able to bring them back using "restore tabs".

Two days ago my wife was using my computer (I was out of town) and when she finished she tried to turn off the computer. She got a message that Firefox was not closing so the computer could not shut down, then a minute later (without her doing anything) the computer did shut down.

I got home todaty and started the computer. Opened Firefox and found all of my saved/open tabs (~25) were gone. No "restore tabs" option available.

Is there any way I can locate and restore the missing tabs? I've looked through some posts in Support, but all of the crash issues I found were of a different type. And it would also be really nice if I can get Firefox to close normally again. Are there any plugins that commonly cause this kind of problem?

Thanks in advance for any help!


All Replies (4)

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No idea if this will help but here is the latest crash report data


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Tell the wife: when shutting down the computer, ALL open programs need to be shut down first. Failure to do this can result in corrupt files.

Not all the programs, just the ones the user started. System and other programs will be shut down by the system.

Product Firefox Release Channel release Version 96.0.2 Build ID 20220119190439 (2022-01-19) Buildhub data OS OS X 10.13 OS Version 10.13.6 17G66

bp-2dd0ff2c-54b7-4efe-81ba-9c60d0220124 Signature: mozilla::dom::quota::QuotaManager::Shutdown::$::operator() const::{lambda#1}::__invoke

MOZ_CRASH Reason (Sanitized) : MOZ_CRASH(Quota manager shutdown timed out)


This is for Sumo's Related Bugs 1688116 RESOLVED DUPLICATE Crash in [@ mozilla::dom::quota::QuotaManager::Shutdown::$_10::operator() const::{lambda#1}::__invoke]

1592336 REOPENED --- Crash in [@ static void mozilla::dom::`anonymous namespace'::QuotaClient::ShutdownWorkThreads::<T>::operator()::<T>::__invoke]


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Tom said

. . . . and found all of my saved/open tabs (~25) were gone

You may have corrupt sessionstore [v56] sessionstore.jsonlz4 file(s). Delete all sessionstore* files and the sessionstore-backups folder.

Don't delete the files if you need to rescue any data from them, just move them out of the profile folder to some location where Firefox doesn't look for them. You can try to read out their contents using this tool:

Type about:support<enter> in the address box.

Under the page logo on the left side, you will see Application Basics. Under this find Profile Folder. To its right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder

Linux: Under the page logo on the left side, you will see Application Basics. Under this find Profile Directory. To its right press the button Open Directory.

Locate the above file. Then rename or delete it. Restart Firefox.


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In case you use "Clear history when Firefox closes", try to disable this feature.

  • clearing "Site Preferences" clears exceptions for cookies, images, pop-up windows, and software installation and exceptions for passwords and other website specific data
  • clearing "Cookies" will remove all cookies including cookies with an allow exception you may want to keep


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