Backup

Make a backup profile

The easiest, and most complete, way to backup is to copy your entire profile directory when Firefox is closed.

⚠️ Do not just back up prefs.js. This is because prefs.js is a runtime file that includes more than just your pref changes, and backing up prefs.js does not cover all the things a user.js can alter.

Instructions

Open the profile folder

1. To find your profile directory in Firefox, go to about:support.
2. Find the 11th item listed, Profile Folder, and select Open Folder button.

Copy+paste contents

3. Close Firefox. Copy the contents of the folder.
4. In Explorer (Windows) or Finder (macOS), go back a page to see all the Firefox profiles.
5. Create a new folder, and paste the contents into it.

Name your profile

6. Rename your copied folder to something meaningful, and keep the original name (for an easy rollback).
   • For example, if the profile folder is called ljgba71b.default, a backup copy might be called ljgba71b.default-backup or ljgba71b.default-pre-betterfox-userjs.
7. Open the new profile folder and paste the contents into it.
8. Close the window. You now have a backup profile! 😄

Be aware that this is your entire profile. So switching back to your old profile will not keep any new cookies, saved passwords, bookmarks, extension changes, etc.

🛑 Always make a backup!