I just got the latest mirc version, and i noticed that it lacks the option to select which browser it should use.

I've also been poking around, and I see that (as I've experienced) it doesn't even use the system default, although that is listed as fixed in v6.02!

I'm really surprised you removed that option; especially when you see all the scripts which modifiies mirc to be customizable to the extreme, while you cut back on it.