So, I just gave up and created a program that converts iso-2022-jp to HTML. It's not a perfect solution, given the fact that (a) it doesn't work in titles, (b) I have to write the post in Emacs then convert the file to HTML, and (c) every single character is a escape sequence. Oh well.
So, here I am, deleting all the useless Mozilla sources -- no point in upgrading if all the old stuff works fine. Feh.
Update: Never mind... It does work in titles (I guess because it's not a tag).