Firebug - How to start in JS debugging mode on page load

I am browsing a webpage where, when I click the submit button on the form, it displays a new page where it launches some javascript, and then closes the window.

Is there a way I can go through javascript on a new page? I tried to set the next break in Firebug on the first page, but the next page still closes the window.

(I am open to tools other than Firebug, if necessary, I just need to go through javascript)

Update:

I should have mentioned that I do not have access to the code: - (

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2 answers

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debugger;

firebug, , .

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debugger; JavaScript. F12 .

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