Recently landed on m-c (should work on today's upcoming nightly): a
--jsdebugger commandline flag! So opening firefox with --jsdebugger will
immediately open the Browser Debugger.
What's more, a few minutes ago support landed on m-c for using this flag
with mochitest-(plain|browser|chrome) for the same.
That means you can now do something like:
./mach mochitest-browser
browser/base/content/test/general/browser_overflowScroll.js --jsdebugger
and it'll start the browser, open the debugger, and wait with running
the test(s) until you hit the button on the mochitest UI (e.g. after
you've set breakpoints etc.)
This should ease tracking down the cause of intermittent failures in
these tests. Happy debugging!
~ Gijs
PS: details in https://bugzilla.mozilla.org/show_bug.cgi?id=895471 if
you're interested
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