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My Windows XP system crashed. Usually about:sessionrestore shows me my previous session. But this time, after I rebooted, the page appeared blank.

I was able to find my sessionsstore files in my profile folder. They have names like sessionstore-1.js through sessionstore-8.js. There is also a sessionstore.bak, which was probably created when the system crashed. I don't trust the sessionstore.bak: it's really small in size.

Can I use sessionstore-8.js instead to get back my old sessions?

Also, how exactly do I go about this? Should I quit Firefox before making any changes under the profile directory?

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Check out this blog post for restoring information from sessionstore.bak otherwise just open the sessionstore-#.js in a text editor or check this out. +1 though, interesting question – Raystafarian Feb 28 '12 at 11:42
The above mentioned methods for extracting URLs from sessionstore-#.js extract ALL URLs including each tab's browsing history. (not what anyone wants, I think) – Mark Jeronimus Mar 26 '12 at 8:31

Open the most recent file (probably sessionstore.js) in an advanced text editor supporting RegEx Search & Replace (eg. Textpad, Notepad++).

Replace all "entries":\[{"url":"([^"]*)" With \n\1\n

and the url's of the last opened tabs will appear on every other line.

[Note on textpad: you need to enable POSIX syntax in Preferences/Editor.

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EDIT removed links as the destination URL has moved (and there was too much to copy into this answer).

So, as a quick answer, try sessionstore.js in your Profile folder.

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see if this helps any: remove numbered sessionstore-##.js files (sessionstore-1.js).

Those shouldn't be there and usually indicate that other software is accessing the main sessionstore.js file that Firefox rewrites every 10 seconds.

  • copy sessionstore.bak in the profile folder,rename it to .js replace the cache folders moved in the "recovered files" directory back in their original location replace a couple of missing userchrome.css files with some others from a previous backup delete that sessionstore-1.js
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How is removing the sessionstore-##.js files supposed to help the OP, when he wants to restore the session from one of those files? – Dmitry Grigoryev Oct 2 '15 at 19:00

I know this is old - but just in case someone comes upon this. You can use the utility at to restore your tabs. Just paste in the contents of sessionstore.bak.

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This page has failed with several of my files. A big lack of this page is that it does not say what it is supposed to do. – Nicolas Barbulesco Oct 5 '13 at 8:03
Can you provide the data on which it failed? – Johnny Oct 6 '13 at 13:36
I have over 100 urls in my sessionstore.bak. The website only appears to display about 15 of them. – Rucent88 Apr 5 '14 at 4:07
hi @Rucent88, is there any chance you could provide me with the file so I can see what's going wrong? – Johnny May 28 '14 at 21:07

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