Which tools do you use to debug HTML/JS in your browser?

Question

I\'d like to collect the best debugging aids for all browsers out there. So that would probably be Firebug for Firefox but what do you use for IE? Safari? Opera? Opera Mini?

Answer 1

Using Firefox, in addition to Firebug (as many have previously mentioned) I find Mozilla's Venkman JavaScript debugger rather handy from time to time too.