The Firefox 1.0 Preview Release for OS X is pretty unstable, in my experience, so I decided to go into “uncharted” territories and downloaded two nightly builds: the latest trunk branch and the latest aviary brach. I recommend aviary, personally. It’s the build that will eventually become the real 1.0, and it’s got some pretty nice features already. Also, if you check out MozillaZine, they’ve got a FAQ that explains the different builds. Apparently you can get builds that are optimized for your processor…