Howto use the Firebug console where every you are

console.log() does not work in most situations. A simple solution to debug everywhere is to use Firebuglite. Add this small Javascript it your page and your problems are solved. It detects if the console is available and adds it where needed.

IE Standalone Tester

Because IE is still popular (damit it) and a lot of different versions are spreaded out it is a must to test your webpages with those browser. Unfortunately you can not run them all at once, only if you use many virtualle maschines... but wait, you can!

Just install IETester and you have IE 5.5 to 10 up and runing even with windows 7.