I was looking at about:memory and noticed entries for Facebook and Google+ URLs, even though I didn't have either open. I figured they were probably from the social buttonry that decorates the web these days. No big deal... except they were taking up a bunch of memory! The Facebook button was using over 20mb and the Google+ button was taking over 40mb!
I have never clicked either of these buttons.
So I wrote Wallflower, a simple Firefox add-on (restartless of course) that removes these buttons from any page your browse to, saving your precious memory, CPU and battery life for the content you actually want.
View the source code on Github.