I had severe problems this morning trying to install
Chimera 0.5 (a fully native Mozilla based Mac OS X browser) that took many restarts and some terminal trickery to finally abate. I still don't know the extent of the problem, which is likely unrelated to Chimera itself. But - heads up!
quick explanation of the problems I saw - when trying to copy the new version of Chimera over the old, the Finder would completely freeze up at the beginning of the "Preparing to copy..." process. When trying to throw version 0.4 in the trash, and then emptying the trash, the same problem occured. Then, the Finder would freeze up after login, leaving the system unusable. Even trying to copy the new Chimera in via the Terminal would freeze things up. And all of these freezes spread rapidly to other parts of the UI level (ie - force quit was unavailable, new applications couldn't be launched, etc).
Ugh. Very bad.