I'm sure the intentions behind removing the 4.1 fonts were good (4.2 is in portage), but Gecko uses them to render MathML by default. Reproducible: Always Steps to Reproduce: 1. 2. 3.
Er, looking at the changelog, 4.1 was never there. whoops. Also, I should link the Mozilla page about this. It's quite specific about needing 4.1 http://www.mozilla.org/projects/mathml/fonts/
Created attachment 58924 [details] ebuild
Created attachment 58925 [details] tarball This is a tarball that includes the manifest. I'm including it because the fetch restriction is a pain.
The alternative is to make Mozilla happy with the 4.2 fonts. See bug 52014, comment 10
Adding 93100 as a dep. If it's resolved, this can be bug (92662) can be closed.
I'm not going to add 4.1 fonts as you suggested in comment #5. Thanks for the instructions to update mozilla prefs.