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FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

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FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

I went through the steps on the Mozilla help page, checked theme is default, unticked hardware acceleration, disabled plugins and extensions. FF still crashes when I close a 2nd tab. I can close one tab.

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New Contributor

Re: FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

Thank you to the posters who took their time to reply to me. I asked this question on a message board and one of the posters gave me the problem fix. Evidently it was a conflict between Norton and FF18. I upgraded my Norton (we have a 3 year subscription so it was free) to version 20.0.2.19 (the latest version) and everything runs like clockwork!

8 REPLIES
Site Moderator

Re: FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

Please provide us with crash ids;

1. Click the Windows Start button, and select Run... on Windows XP or press Windows Key + R on Windows Vista/7. Type in "%APPDATA%\Mozilla\Firefox\Crash Reports\submitted" including the quotation marks and click OK.

2. In the resulting folder will be a text file for each crash report you have submitted. Using the View menu, arrange them by date to find out which is the newest file; and double-click on it to open it.

3. Report back to us with the latest crash ids.

Site Moderator

Re: FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

You can check for problems with the sessionstore.js and sessionstore.bak files in the Firefox Profile Folder that store session data.

Delete the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox Profile Folder.

Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost, so you will have to create them again (make a note or bookmark them).


In Firefox Safe mode these changes are effective:

  • all extensions are disabled
  • the default theme is used (no persona)
  • userChrome.css and userContent.css are ignored
  • the default toolbar layout is used
  • the Javascript JIT compiler is disabled
  • hardware acceleration is disabled
  • plugins are not affected
  • preferences are not affected
New Contributor

Re: FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

Thank you very much for taking the time to help me, feer56

This is the latest crash report: Crash ID: bp-a866d329-629b-464d-a538-fbfad2130115

I have lots more LOL. If you need them I can post more.

New Contributor

Re: FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

Thank you cor-el for your suggestions. It is getting late at night here, so will try and follow your directions tomorrow and report back. Could deleting the files you mentioned fix the problem? Sorry, I'm not the world's best computer user so I will need things spelt out clearly for me lol

New Contributor

Re: FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

Hi.. This is also my latest crash report: Crash ID: bp-f798a17c-5ab8-4452-ac91-012592130115

New Contributor

Re: FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

Thank you to the posters who took their time to reply to me. I asked this question on a message board and one of the posters gave me the problem fix. Evidently it was a conflict between Norton and FF18. I upgraded my Norton (we have a 3 year subscription so it was free) to version 20.0.2.19 (the latest version) and everything runs like clockwork!

Site Moderator

Re: FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

Yes Soozn, your crashes are caused by Norton confidential as can be seen from the signature of the crash report: [@ coffplgn.dll@0x3714 ]

Site Moderator

Re: FF 18 crashes when I close more than 1 tab, it doesn't happen in safe mode, but even when I disable all shown plugins, extensions etc the problem occurs.

Hi skipper386

I'm not sure about your crash report:

Did you try some basic steps like Firefox safe mode?

In Firefox Safe mode these changes are effective:

  • all extensions are disabled
  • the default theme is used (no persona)
  • userChrome.css and userContent.css are ignored
  • the default toolbar layout is used
  • the Javascript JIT compiler is disabled (seems to be involved in your crash)
  • hardware acceleration is disabled
  • plugins are not affected
  • preferences are not affected

See also: