addon command for GCLI – install addons from Firefox' command line!
Imagine. You install Firefox. You open up the command line and type
addon install adblock-plus
In a mere two seconds, your Firefox will be equipped with an ad-blocking add-on.
Everyone will be so impressed. Men will want to be you; women will want to be with you. (Except if you're a woman, as in such case it will probably be the other way around.)