For testing or porn, use a nightly build (Score 4, Informative)

Mozilla 0.9.8 branched Tuesday 1/23, giving it more time to sit on a branch than most milestones get (I don't know if this was intentional). If you think you might report bugs, you should use a newer build, since 0.9.8 is effectively two weeks old. Also, 0.9.8 does not include a fix for a bug that caused porn sites to give 404 or 403 errors when users tried to open thumbnail links in separate windows.

Mozilla "nightly" builds always have the latest bug fixes and features, but they also have the latest regressions. For example, build 1/27 could not save files and some builds starting with the evening builds on 1/31 did not support cookies*. Builds after 1/31 use a new "wyciwyg" scheme to handle document.write(), leading to some problems that have not yet been ironed out.

I've been using a morning build from 1/31 for several days and it seems to be free of major regressions. Here are some of the 1/31 morning builds for various operating systems: Windows Mac MacOSX Linux.

* Don't get a broken build just to be free from cookies. You can turn off cookies in any build by selecting "disable cookies" in the security/privacy preferences.