Mibbit actually turned out to be more nifty than I thought, since it has registration and autojoin settings (alongside the much-required option to disable graphical emoticons).

I should probably change the coloration of “Your name mentioned” tabs, though. It’s one of those dark shades of red that I have trouble discerning from brown. I don’t know what kind of partial color-blindness I have — none of the standard descriptions from Wikipedia fit exactly, although I fail the protanopia and partially (depending on monitor brightness settings) deuteranopia test. What I know is that I have trouble distinguishing between dark brown and dark red, as well as between light green and yellow.

Damn you, Y chromosome!