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.
This provides separated "Bookmarks" Sidebar panel like Opera.
Makes the Bookmarks and History Sidebars a flat list view, instead of the traditional tree view.
Places a "Manage Folder" item on the context menu of bookmark folders, which opens the "Places Organizer" expanded to that folder.
Persistent and private sticky notes for Firefox.
Creates a formatted page from bookmarks.
（alt. "BookmarksHome" for Firefox1.5）
OPML Support adds OPML import/export functionality to the Firefox Bookmarks manager.
Add Unsorted Bookmarks Folder to Bookmarks Menu