How many bookmarks do I have total in Firefox?
Solution 1:
Open the bookmarks manager by pressing Ctrl+Shift+O (thanks to rugk), or by clicking the all bookmarks button in the bookmarks menu, then select the 'All Bookmarks' folder.
In the top-right hand corner, search for a character which appears in all bookmarks, e.g. . or /.
Press Ctrl+A to select all items. You can then see how many bookmarks you have total next to the 'items' indicator.
Solution 2:
Open Bookmarks Manager then go to Import and Backup. Hover over Restore and the flyout reveals how many bookmarks you have.