A good while ago I made a regression range finder for Firefox nightlies. It was a Python script intended to make it easier for people to manually find the regression ranges of bugs on the nightlies. The other day, someone actually used it! So I decided to revisit it and fix it up and make it easier to install. There’s more info about it here, but here’s a quick summary:
install with setuptools or pip if you know how to do that, otherwise checkout out the OS-specific installation instructions
run on the command line:
mozregression --good=2010-03-19 --bad=2010-09-12
Several nightlies will be downloaded and automatically run for you, asking you to check for the existence of the bug in each one, ending up with something like:
Last good nightly: 2010-09-08 First bad nightly: 2010-09-09 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=36f5cf6b2d42&tochange=8e0fce7d5b49
if you have questions, ask harth on #qa at irc.mozilla.org.