Xmarks is the #1 bookmarking and open tab add-on. Keep your bookmarks, and open tabs backed up and synchronized across computers and browsers. Mobile phones with Premium access. Utilize LastPass to sync passwords!
A productive way to organize, read and share the content of your favorite feeds, blogs and news sites. Feedly offers a seamless transition from Google Reader.
GMarks helps you sync & manage your bookmarks with Google Bookmarks...
Creates a menu to access google bookmarks from any computer. Needs Google Account to use this extension.
Makes the Bookmarks and History Sidebars a flat list view, instead of the traditional tree view.
This provides separated "Bookmarks" Sidebar panel like Opera.
Persistent and private sticky notes for Firefox.
OPML Support adds OPML import/export functionality to the Firefox Bookmarks manager.
Add Unsorted Bookmarks Folder to Bookmarks Menu
Tidy up your favorites with live thumbnails. Conveniently use the same set of favorites for all your PC. Silverlight is required to use this Add-on.
Creates a formatted page from bookmarks.
（alt. "BookmarksHome" for Firefox1.5）