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Firefox Sync - Bring your Firefox bookmarks, tabs, or passwords wherever you go with Firefox Sync. Share between computers and mobile devices. Get Firefox now!
LinkAce - A selfhosted bookmark manager with advanced features.
Bookmark Sidebar - Adds a toggleable sidebar with all your bookmarks at the edge of your browser window.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
start.me - A Modern-day bookmark manager. A place for your favorites. A news feed (RSS) reader. A browser startpage. A portal for your team.