It's too bad the nightly build branch has gone to 3.7. Trying various 3.6pre builds I noticed from day to day, sometimes the autoupdate would be fine, sometimes things would get flaky. I started downloading and saving full installers for the nightly builds that seemed rock solid. If I got a flaky update, I'd run one of the solid build installs. FEBE and SyncPlaces would make sure I didn't have to reconfigure everything if something strange happened.
One thing about the nightly builds, they have them configured to install in a separate folder(Minefield) and just inherit your profile. If you uninstall Minefield, the other firefox already on your system should work as it did before except on first launch it will take you to the page as if you updated.
As 3.7 goes along you might try a few and see if one stands out as much better than what you have. The changes will be much faster than waiting for 3.5 updates. I know what you mean about the Firefox minority of problems. Seems like when 3.x came out it was totally unusable for me while many others were happily browsing along. I stayed with 2.x for a long time. 3.0x and 3.5x didn't seem any better. That's why when I read about this
jit stuff and 3.6pre I decided if any 3.x is flaky anyway, I might as well go for some speed. Worked out well in my case.
I realize it doesn't necessarily mean it will automatically work great on your system. Just with rapidly changing builds you have more shots at the bullseye.
