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Google +1 Button
Sigh. I keep forgetting I have this extension. Worse, I keep forgetting I have Google Plus. I use Twitter all the time, but haven't yet come to terms with Google Plus. Oh, it's far less annoying than Facebook (except for G+'s insistence on telling me everyone's birthday during Google searches), but it doesn't seem to add much value to my daily work.
Even so, having a quick +1 button is a help, if only I'd remember to use it.
How often used: Rarely.
Live without it factor: I could, because I could live without Google Plus. Sorry!