StephenTanner.net Technology and Internet, what works best for me.

Mozilla Weave

From Mozilla Labs:

Weave is a project to integrate web services into Firefox by allowing users to securely share their data with other users and 3rd parties.

If you have ever used either Foxmarks, Google Broswer Sync, etc... then you already know how helpful such extensions can be.
The main reason for these extensions is to sync your bookmarks (and in Google's Browser Sync much more) and store it off site at some server, and then when you use your computer at work, or a different one around the house, all the bookmarks match up. This way you never have to double bookmark stuff, or email yourself at your personal email address, or write down a web address just to access it when your somewhere else.
There is also another benefit, automatic backup of your bookmarks. This comes in handy when you do things like accidentally do a rm -rf / instead of rm -rf ./.