Greasemonkey is a user script manager. It is an extension for the Firefox web browser.
So what does it do?
It adds user created functionality to the web sites you use.
Very easy to use:
But my favourite script so far is this one, SSL Certificates Pro, which opens many popular websites automatically with https.
Any others you’ve tried & like to share?
Edit: I’ve just found https-everywhere, another Firefox plugin wich uses https at every opportunity