Shin'ichiro TAYA wrote:
 
>  Using same xpcom code as Linux using, firefox works on current amd64.
>  I don't known about 3.0.
>  Does anybody using 3.0 confirm this ?
>  
>  ftp://ftp.netbsd.org/pub/pkgsrc/pub/pkgsrc/misc/taya/firefox.tar.gz
>

Apologies for the late response. 

The above version of the firefox package builds (and runs) fine inside a 
3.0 build environment inside -current.