Ok, so I did a full kernel + world update last night, checked out a fresh copy of the ports tree, and re-applied the marcusmerge.

All my logs/conf are on http://87.194.39.182/fbsd/ff3_logs/ - the large logs are also there bzipped, as I'm not sure if I've set up deflate on that server.

With this done, the port fails to build whilst linking a javascript library (ff3-build-unmodified_port_makefile.log). With the patch Makefile.diff applied to the port makefile, the port builds (ff3-build-patched_port_makefile.log), but the resulting binary exhibits the strange address bar issue I described earlier. I have some very weird library sonames being built (see libnspr.txt). I thought that ld-elf only looks at the first numeric of a soname, so 'libfoo.so.0.1' is invalid, but the port seems to be building (at least) libnspr4.so.1.0.

There is also the usual kernel conf, make.conf, uname and pkg_info on the website. In my make.conf, you'll see I am using ccache, but I wasn't yesterday - Firefox takes way too long to rebuild without ccache :)

If anything else would be useful, let me know.

Cheers