I've figured out that the Safari feature I miss in Firefox is spell-check-as-you-type. I should quest for an extension that does that.
Oh, I've got zephyr working locally on Gigo now! Well, as long as I have a hostname. So, not at home, and probably not on this sketchy connection. I should be able to get Metacarta internet permissions, and maybe even a hostname, but I can survive without local Zephyr, so whatever. (Zephyr being an MITish IM protocol, for you not MIToids.)