I posted about an extension I built to help me manage my bookmarks yesterday. It sends you an email of all the bookmarks you make for that day at the end of a day (similar to a news letter). You can find it at linkdrop.co

It sounds like you are more concerned with management than rediscovery, though, so it might not solve your usecase. In that case, I would definitely recommend getpocket.com for saving bookmarks across browsers/machines.