Firefox's Bookmark Manager allows you to sort your bookmarks, as well. There are two ways to do this:
You can manually sort bookmarks by dragging & dropping them to a new position
You can use Bookmark Manager's automatic sort function.
To access the automatic sort function, select View in Firefox's Bookmark Manager.
(The sorting-related options have been marked in orange)
Unlike for the Mozilla Suite, this will only rearrange the bookmark order in Bookmark Manager. If you want to rearrange the order in which they appear when you select Bookmarks, right-click on any bookmark in the browser window (not in Bookmark Manager) and select Sort By Name.
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More on Mozilla Bookmarks>>
Firefox's Bookmark Manager Bookmark all open tabs Basics: Bookmarking a page Mozilla’s Bookmarks Toolbar
Source-mozilla.gunnars.net