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Last active July 20, 2025 00:51
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Firefox Profile Root Directory information
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FF-Profile.md

What is the Root Directory?

This direcotry stores all your profile's persistant data, including bookmarks, history, passwords, preferences, extensions, custom themes, website data, security settings, and browsing sessions.

How to find your Profile's Root Directory

Step One

  • In your URL bar, type: about:profiles and hit Enter.

Step Two

  • Identify which profile is in use. The about:profiles page will tell you which is currently in use.

Step Three

  • For the profile that is currently in use, clike the Open Directory button for the Root Directory entry.
image

What is the Chrome folder?

Inside your Root Directory, you'll see many folders. The Chrome folder holds your CSS files. By default there are userChrome.css & userContent.css files in the Chrome folder.

What if I don't see the Chrome folder?

  • You can create one. Manual creation works just fine.

What is userChrome.css?

  • This file allows custom CSS to be applied to the browser UI (the browser chrome).

What is userContent.css?

  • This file allows custom CSS to be applied to website content, about:pages, and extension content.
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