>
> The green lines are executable lines, that is lines with JavaScript that
> can be reached by the debugger when you set a breakpoint.


​That seems almost tautological. What is it that makes one line of
JavaScript "executable"  in the sense you mean, and another line not? My
code lines that Firebug refuses to break at​ (whether or not it shows green
line numbers) *are* executing in the page, because I can see that the page
is working correctly, and it couldn't if those code lines didn't execute.

​So apparently what's "breakable" for a debugger is actually a limited
subset of what's "executable" for the browser as a whole, but *why?*
What's the limitation or pattern there?​

That's a different question from, but presumably related to, the issue of
Firebug not accurately predicting (with the green) which lines it will be
able to break at.

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