Review for DOM Inspector by Dave G
Rated 5 out of 5 stars
Once came bundled with Firefox itself, now spun-off into its own extension. If you're a developer of anything remotely web-related, get this. It's the #1 tool for all of your debugging needs.
This review is for a previous version of the add-on (2.0.0).To create your own collections, you must have a Mozilla Add-ons account.