Profiles – Where Firefox stores your bookmarks, passwords
Manage profiles when Firefox is open Type about:profiles into the address bar and press the Enter key. This will open the About Profiles page.
Where is the Firefox user profile?
On the menu bar, click the Go menu, hold down the option or alt key and select Library. A window will open containing your Library folder. Open the Application Support folder, then open the Firefox folder, and then the Profiles folder. Your profile folder is within this folder.
How do I fix my Firefox profile?