Camino 1.5.3 was released earlier this month to address problems introduced in Gecko 220.127.116.11. This sounds like the same reason why Firefox 18.104.22.168 was released. If you haven't already, you should take this opportunity now to update to the latest version.
The Camino browser is a Mozilla-based web browser designed to integrate smoothly with Mac OS X. It sports a more OS X-like look and feel.