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Is that a duplicate of this topic? Are you running the latest firefox? I am running the firefox 3.6.12 and I don't see any problem. Except for a double underscore that I fixed. I also added some backquotes around formulas with underscores in them, just for safety's sake.
Anyhow, for future reference, here is the answer in question.
@Peter: yes. Anton explained in a separate thread that he installed the new fonts for MathJax. This is because Firefox 3.6.13 made some security changes that broke MathJax, something (AFAIK) first noticed on Math.StackExchange.com.
This also causes some problem with older versions of firefox (3.6.12 for me), which can be solved by installing the STIX fonts.
Actually, it looks like when Anton upgraded MathJax, he also moved it to a different path on the server. (Maybe I'm misunderstanding things, also.) The upshot is that for a while MathJax was just running out of people's browser caches. I added a soft-link server side so both URLs work for now, and we'll sort it out later.
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