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javascript: firebug not allowing to set breakpoint in certian scripts

I am using firefox+firebug for javascript development. While setting breakpoints in the scripts,for certain files, it allows and for some files, but for certain files it doesn't [which are loaded, and throws alert messages, if I put alert() there]. If I try to set break point at that line, the red-dot is marked at the last line of the script file, instead of the place where I needed. I am attaching a screenshot of the issue.

firebug

Line 56 is where I wanted the breakpoint, but the breakpoint automatically moves/set at line-66, which is at the end of script file

Solution

  • This is a known bug in previous versions of Firebug 2.0, which should be fixed in the current version (currently 2.0.17).

    Note that Firebug is going away once multi-process Firefox is released, so it´s recommended to use the browser internal DevTools instead, which don´t have this issue.