This is really nice, and it's great to see a non-Chrome version, too (working great in Firefox so far). Chrome often gets all the love (and is a great choice) for new dev tool extensions, but many of our clients -- for one reason or another -- can't/won't use Google's browser on intranet-based solutions. It's nice to be able to test/debug on more than one browser (Some of us still have to party like it's 1999).
