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Firefox now has Firefox profiles inside of Firefox profiles

The makers of Firefox made Firefox disappear up its own butt.

Firefox has had Firefox profiles since probably day one. "Firefox -p" invokes the profile manager.

I discovered today on a customer's computer that Firefox now has a second Firefox profiles feature inside an existing profile which can be found for example by clicking on the Firefox menu then click on 'Profiles'. It's called exactly the same thing as the first feature, and these extra profiles do not show up in the original profile manager. This of course won't cause any confusion at all, but the important point to note here is *this is how it works in Chrome*.

<facepalm> It's like when I discover a customer has a Documents folder in their Documents folder, usually with a similar contents list to the parent Documents folder but not quite.

Did the devs forget that the Profile Manager already existed or something? Was this a desperate attempt to avoid doing useful dev work, or are the higher-ups responsible for this idiocy?
 
The makers of Firefox made Firefox disappear up its own butt.

Firefox has had Firefox profiles since probably day one. "Firefox -p" invokes the profile manager.

I discovered today on a customer's computer that Firefox now has a second Firefox profiles feature inside an existing profile which can be found for example by clicking on the Firefox menu then click on 'Profiles'. It's called exactly the same thing as the first feature, and these extra profiles do not show up in the original profile manager. This of course won't cause any confusion at all, but the important point to note here is *this is how it works in Chrome*.

<facepalm> It's like when I discover a customer has a Documents folder in their Documents folder, usually with a similar contents list to the parent Documents folder but not quite.

Did the devs forget that the Profile Manager already existed or something? Was this a desperate attempt to avoid doing useful dev work, or are the higher-ups responsible for this idiocy?

My firefox install doesn't have this problem.

There are a couple of ancient profiles on the machine from past version upgrades within the Windows Appdata folder structure associated with major Firefox version upgrade points where the new update had to modify the profile, but no profiles within a profile. Invoking the profile manager (or using the profile menu) allows me to create/delete profiles, set the default profile, or change to another profile if I have created one.

Unless I am totally misunderstanding what you are talking about.
 
I can't find a gui [profiles] button. Maybe I'm looking in the wrong place. I haven't used profiles much, and I've only done it manually in the past. My firefox is also old, cause debian.
 
I can't find a gui [profiles] button. Maybe I'm looking in the wrong place. I haven't used profiles much, and I've only done it manually in the past. My firefox is also old, cause debian.

If you don't have a Profiles menu option, that means it is turned off in about:config. To turn it on, go to about:config. Then, search for browser.profiles.enabled and set it to true. The profile menu option should then be added to the file menu bar between the Bookmarks and Tools menu options.

Adding it to the menu bar doesn't change anything, so it doesn't hurt to have it there.
 
My main profile doesn't have this menu option, though me having a Firefox sync account might have something to do with it (I can't imagine why though). A fairly virgin test Firefox profile on my Linux PC (Firefox v148) has it.
 
My main profile doesn't have this menu option, though me having a Firefox sync account might have something to do with it (I can't imagine why though). A fairly virgin test Firefox profile on my Linux PC (Firefox v148) has it.

My Waterfox install previously didn't have it, and it just suddenly showed up in the menu bar there after the last update was offered a week or two ago.

I don't have a Firefox sync account at all. It didn't ever appear in Firefox on my menu on my primary machine, but I may have turned it off and just forgotten about it.

From what I've read, the profile GUI feature option was originally first implemented with Firefox 138 in April 2025 to make it easy to have multiple profiles and switch between them (such as having separate work and personal profiles), and then was majorly upgraded in Firefox 144 last October. The October update was where browsing history, bookmarks, extensions, and logins were maintained separately for each user profile.

Maybe that is the reason you saw the "profile within a profile" on that machine, as it might have been intended to allow multiple profiles PER USER. If that is the case, you wouldn't see it if the user hasn't added multiple profiles.
 
Are you on Windows 10? If so perhaps this new feature is related to your issue.

Firefox Backup is now available on Windows 10 to users who also use the “Clear history when Firefox closes” capability. Backups will not include any data which is set to be cleared when Firefox is closed.

 
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