Your Bookmarks (and History) are stored in a single file, places. sqlite, in your Profile folder. To open your Profile folder, Help > Troubleshooting Information , then next to "Profile Directory" click the "Open Containing Folder" button to open the Profile Folder.

%APPDATA%\Mozilla\Firefox\Profiles\ A list of profile folders will appear. Click on the profile folder you wish to open (it will open in a window). If you only have one profile, its folder would have "default" in the name.

Type about:config in the address bar and press Enter. A warning page may appear. Click Accept the Risk and Continue to go to the about:config page. Search for useragent by typing it into the Search preference name field.

Turn on the Menu bar or Bookmarks toolbar , click More tools… and choose Customize toolbar…. Click the Toolbars dropdown menu at the bottom of the screen and choose the toolbars you want to display. Note: The Bookmarks Toolbar can be set to Always Show, Never Show, or Only Show on New Tab. Click the Done button.