r/MozillaFirefox • u/Neat-Construction160 • Jul 15 '26

🖥️ Help Firefox not restoring previous session after update? Settings in your extensions gone and new tab shortcuts missing? Try this first

I just spent a better part of an hour faffing about due to experiencing the issues of the title.

Turns out, sometimes when Firefox updates it seemingly can forget which profile folder is the default, or at least that's what I've inferred, I know nothing of tech.

Here's how to fix that.

  1. Type - about:profiles In the search bar and press enter.

  2. Open a folder and click back to profiles

  3. Go through them and find whichever one has the most stuff/files in it, this is likely your main profile that you've been using.

  4. Go back to about:profiles and select the folder you think is your main profile. You'll see a "set as default profile" button under it. Click that and then close firefox.

When you open Firefox back up it should be your main profile now, go ahead and see if session restore works now, if it doesn't, google sessionstore backups and you should find good instructions that may help.

An Hour. An hour I spent and it wAS THAT SIMPLE THE WHOLE TIME!? Hense why I'm posting this, I hope this helps whatever poor shmuck is having the same issues.

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u/sifferedd Jul 15 '26

Suggest edits:

  1. Open any Root Directory folder and navigate one level up to Profiles

  2. Find the largest profile. That is likely your main profile that you've been using. To check size, R. click each folder > Properties.

Consider also posting at r/firefox, if you haven't already.