My preferred browser is:
http://www.mozilla.org/products/firefox/
but you can try it with others. I've tried Internet Explorer, Safari and Google Chrome and none of them seem to work properly for this application. Sorry about that, but it does work great on Firefox!!
You can download and install extra fonts/symbols at:
https://developer.mozilla.org/en-US/docs/Mozilla/MathML_Project/Fonts
This is an installer: download, run and you're done.
Additional Remark: If you have an older version of Windows, you may need to download the "Windows installer" (comes with XP). Go to the microsoft site, if you need to. In fact, my Windows Internet Explorer doesn't work at all with this page. The Mathplayer people have been trying to get Microsoft to fix the ie bugs, but apparently they are not cooperating... Are you surprised?
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