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Firefox 15 is not restoring last tabs.

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New Contributor

Firefox 15 is not restoring last tabs.

Simply put, Firefox 15 is not restoring my last session. I have it set in my options to restore the last session, but it's not happening. Prior to the update, it was working, and now it's not working on both of my computers.

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Accepted Solutions
New Contributor

Re: Firefox 15 is not restoring last tabs.

Found out the real reason why it wasn't working: the add-on Super Tab Mode caused the pages to not load.

16 REPLIES
Site Moderator

Re: Firefox 15 is not restoring last tabs.

Can you still restore the previous session via History > Restore Previous Session?

If that menu entry is grayed then session restore isn't working properly.

Does it help with selecting this startup setting if you are not already using it?

  • Tools > Options > General > Startup: When Firefox Starts: Show my windows and tabs from last time

Are you using any cleanup software like CCleaner that may prevent Firefox from creating a sessionstore.js file? Is there a sessionstore.js file in the Firefox Profile Folder?


It is possible that there is a problem with the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.

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).


New Contributor

Re: Firefox 15 is not restoring last tabs.

No, I cannot restore it by using restore previous session. The settings in the options menu are correct. I am not using any cleanup programs, and there was a sessionrestore.js file.

I tried deleting those files, created a new session, and then closed and see if the restore session would work, but it didn't.

Site Moderator

Re: Firefox 15 is not restoring last tabs.

You haven't confirmed whether the History > Restore Previous Session entry is not available (grayed), so you you please answer that?

Did you check in the task manager that Firefox is closing properly?

Does it help if you use "Firefox/File > Exit" to close Firefox if you are currently doing that by clicking the close X on the title bar?

New Contributor

Re: Firefox 15 is not restoring last tabs.

Yes, it was grayed out. I did not check in the task manager, and I was using the close x on the title bar.

Site Moderator

Re: Firefox 15 is not restoring last tabs.

If that entry is grayed then Firefox didn't succeed to save that session data.

If the startup setting is "Show my windows and tabs from last time" then Firefox should save the current session data every 10 seconds.

Does the sessionstore.js file contain the URLs of the previous session?

New Contributor

Re: Firefox 15 is not restoring last tabs.

It is showing the URLs of my current session.

New Contributor

Re: Firefox 15 is not restoring last tabs.

Another behavior I'm noticing:

If I close firefox with only 1 tab, it will restore that tab. If I have multiple tabs, it will just show up as a single blank tab.

Another thing: Sometimes, it will load up the URL of the last tab in my session only, but it won't load up the page automatically.

Site Moderator

Re: Firefox 15 is not restoring last tabs.

Do not use "Clear history when Firefox closes" to clear the "Browsing History".

New Contributor

Re: Firefox 15 is not restoring last tabs.

It is currently set to remember history.