browsers and core dumps

[Paulo Geyer <paulogeyer%gmail.com@localhost>]

I've installed netbsd few days ago, and couldn't do much in it yet

the OS is fast, what is awesome for this old computer (1.6ghz, 2gb ram), 
but I coulnd't install or use Midori/Epiphany, and Firefox (17) is too slow

these are the problems I have here
* firefox binary package is broken
* Midori binary package is broken (core dumps, and missing libicu library)
* Midori compiled using pkgsrc gives me core dump when I try to use
* Epiphany binary package core dumps too

I installed netbsd using the netbsd-INSTAlL via netboot, did a full 
install for 6.1 kernel and sets, amd64

Other issues:
wpi driver loses connection sometimes
networking boot is too slow, (can't set to run in the background while 
booting?)
emacs core dumps sometimes too

What can I do to solve these problems?