What is the FullCircle folder doing in my OS X Application Support Folder?

In the process of debugging some very, very annoying Firefox 2.0/Adobe behaviors, and purging my MacBook of anything to do with Adobe (more on that later) I came across a folder called "FullCircle" within my "Application Support" folder. It had MozillaCamino strings in it. What the heck is that, I wondered ...

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:

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.

This was surprisingly hard to uncover!