Open the Bookmarks Manager; Press the Alt or F10 key to bring up the toolbar, and select Bookmarks. Hot key is <Control> (Mac=<Command>) <Shift> B.

From here you can move, delete or edit the data.

You can right-click a bookmark and open the Properties to make changes to bookmarks. You can also use the Details pane at the bottom right in the Bookmarks Manager (Library; Show All Bookmarks). You can click the highlighted star on the Navigation Toolbar to edit a bookmarked page opened in the current tab.

See also:

• https://support.mozilla.org/en-US/kb/how-do-i-use-bookmarks
• https://support.mozilla.org/en-US/kb/Sorting+bookmarks