Freddy, just go to any site that uses mathml - search for mathml, for example - and make sure that pango rendering in firefox is enabled. If I recall correctly, pango is only used for firefox rendering now if there are certain language support packages installed which need the enhanced language support - in other words, the bug hasn't been fixed, but it won't show up for most users now.
-- Pango-enabled firefox breaks MathML support https://launchpad.net/bugs/19066 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs