Bookmarks, also known as favorites, are links to sites that you save when you browse the web. These links are useful for future reference since they save you the trouble of remembering and typing website addresses over and over again. The problem with bookmarks is that they are specific to the web browser and the computer you save them on. You can, however, take additional steps to ensure the bookmarks you save on one of your computers is available on others.
Browser specific syncing
Browsers Firefox and Google Chrome both offer their own default solutions to syncing bookmarks. Firefox Sync can be used to sync not only bookmarks but passwords and browser history across different Firefox browsers including Firefox for mobile devices. If you have a Google Account you can sign in to Google Chrome to sync bookmarks, extensions, themes and browser preferences.
Update (May 7, 2018): Xmarks has been discontinued so this is no longer a viable alternative