Firefox has a profile manager in about:profiles. I created a new profile to troubleshoot compatibility issues, but absolutely everything including addons and about:config entries was moved to the new profile.

I can't understand as this is the description on the page:

This page helps you to manage your profiles. Each profile is a separate world which contains separate history, bookmarks, settings and add-ons.

How to reset everything to the default in the new profile?

  • 1
    Just tried it out myself. Created a new profile through about:profiles and none of the addons, bookmarks, etc, followed over to the new profile. – n8te Aug 13 '17 at 8:52
  • Rename both Firefox user folder in %LocalAppData% and %AppData% folder. Open Firefox and it will create a new profile. – Biswapriyo Aug 13 '17 at 8:59
  • @n8te: Did you press "next" and "finish" in the profile wizard, no custom changes? It may be necessary the refresh Firefox to solve this issue of mine. – user598527 Aug 13 '17 at 9:24
  • @Biswa: Does this yield different results than this answer? – user598527 Aug 13 '17 at 9:25
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    idk about this about:profiles page but you can just rename your entire "profiles" folder to something else, start Firefox and it will create a completely fresh profile for you. – user1306322 Aug 13 '17 at 20:43

I was able to create a new profile using Firefox's alternative profile manager.

Important: Before you can start the Profile Manager, Firefox must be completely closed.

  1. Press Windows Key+R on the keyboard. A Run dialog will open.
  2. In the Run dialog box, type in: firefox.exe -P
    Note: You can use -P, -p or -ProfileManager.
  3. Click OK. The Firefox Profile Manager (Choose User Profile) window should open.
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    The Mozilla support page has no instructions for other operating systems. – user598527 Aug 13 '17 at 9:41
  • 2
    Running that (without .exe, of course) on terminal on archlinux worked fine. – Ave Aug 13 '17 at 19:03
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    Adding the parameter --no-remote allows you to use the profile manager while Firefox is running, but of course you will not be able to modify or load any profiles currently active. – BoffinBrain Aug 30 '17 at 12:17

It might be easier to do it manually.

Go here: %APPDATA%\Mozilla\Firefox\Profiles

Then create a new folder.

Then edit %APPDATA%\Mozilla\Firefox\profiles.ini

And add a new section like:


You can also change this to 0 in the file to get it to prompt for the profile you want:

  • While the process for creating a new profile is correct, this method either isn't unfortunately working for me. I will likely refresh Firefox. – user598527 Aug 13 '17 at 9:22

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