I'm not too sure if firefox 1.5 is supported in GnomeSword.
anyways, here is the error's found when compiling
GnomeSword with
./autogen.sh --prefix=/home/pierre/.gnomesword-2.0/
--enable-moz_embed --with-firefox --enable-debug
errors occured in file embed.cc
Compile errors
Logged In: YES
user_id=31632
I believe this is fixed in svn