It's part of the Mozilla feedback/crash reporting system, and it's used by both Camino and Firefox (and probably Mozilla/Netscape too). For example:
Mac OS X 10.4.2: Questions And Answers:This was surprisingly hard to uncover!
To troubleshoot, I would delete the Firefox and FullCircle folders from / Users / [user] / Library / Application Support, and search for a Mozilla folder or files (on the entire boot drive) and delete them, too. Repair Permissions again, reboot, and then the same problem.