Backup

Make a backup profile

Changes caused by a user.js file will alter your Firefox profile.

In case you want to revert back for any reason, you should way create a copy of your entire profile directory.

⚠️ Deleting the user.js will NOT revert any changes. (Just because all of the changes were stored in a user.js file doesn't mean your profile will revert back.)

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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! 😄

🛑 Always make a backup!