I have a problem that makes Firefox behave strangely during startup.
(In particular, it displays the message “Firefox seems slow ... to ... launch,” although I did not install any new extensions or anything like that.)
The function that displays this _showSlowStartupNotification message in browser/components/nsBrowserGlue.js , which is called from _trackSlowStartup , which in turn is _onFirstWindowLoaded .
I want to debug this. How can i do this?
I can easily debug Firefox binaries using the WinDbg and Mozilla symbol server. But that is not what I want. I want to debug XUL, not C ++.
I can debug XUL if I turn on the Browser Toolbox , but only after launch. Even if I set devtools.debugger.prompt-connection to false and run firefox.exe -jsdebugger to immediately open the browser toolbar, I only gain access to it after the startup code has already been executed. Setting a breakpoint on an interesting function does not help, because they are not constant; restarting Firefox does not debug the internal XUL debugger.
So, any suggestions? Is there a way to debug Firefox XUL from the start?
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