MathJax is a popular Javascript library to display mathematical formulas in any browser. This is a bug to track issues related to MathJax. I will make a list of several issues found by the MathJax team, report these issues and make this bug depend on them, as soon as I get the editbug rights. For the moment, I can mention bug 50210, bug 62187 and bug 43949 comment 39.
I opened bug 84019 for issues more specifically related to Webkit MathML support.