I want to know how to access JavaScript execution trace at runtime. I saw 
Firebug can do something like this:

[image: enter image description here]

Refer to the image above, all the line numbers executed are highlighted in 
green. They are achieved at runtime. I guess there must be some way to 
access those info from the JavaScript engine used by the browser.

Say now I want to build a firebug plugin to access those info and examine 
all the variables in each executed line at the runtime, how should I do?


Thank you!

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