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.

When a web feed is available from a web page, you can use Firefox to subscribe to it as a Live Bookmark. Firefox checks your Live Bookmarks every hour for updates, which enables you to stay current with the latest information from your favorite sites. Live Bookmarks work with any web feed in RSS, RDF, or Atom format.

%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.