I'm trying to debug my firefox extension in Firebug. When there is error in the code, Firebug pauses on the code and I can jump to the code that caused error. The problem is when I want to set breakpoint in the code and trace it, it should theoretically be possible, but I can't find it.
Let's restrict this question to Firebug. I'm not satisfied with Venkman (and solve it elsewhere).
thank you for help