User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10_5_8; en-us) AppleWebKit/533.18.1 (KHTML, like Gecko) Version/5.0.2 Safari/533.18.5 Build Identifier: Firefox 4.0 Beta 7 Error Message reads: "You cannot open the application "Firefox" because it is not supported on this architecture." Reproducible: Always Steps to Reproduce: 1. Drag mounted image to Applications folder 2. Drag Application Icon to Dock 3. Double Click on Firefox Icon in Dock Actual Results: Receive error message Expected Results: Application would open I could not attach the error message received, however, I can send it if needed.

This is a known issue - please note that "We have decided to drop support for PPC/OSX for Firefox 4" See Bug 587799 for more info