Now I put my firefox-trunk (3.0b2pre now) package at
The package is based on firefox-188.8.131.52-2.
It includes some adhoc artifice to success to build.
libgtkembedmoz.so and libxpcom.so is not built by default. now.
This change may affects yelp and devhelp (and AdobeReader-8.*) packages.
Feel free to incorporate to firefox package in Fedora.