web export with mathjax doesn't do that

Exporting a document to the web and selecting the export with mathjax option from the popup on the save dialog leads to no apparent difference to the default export. Certainly when opened in a non-Firefox browser the results are bad.

The generated .html does

The generated .html does include the command to add MathJax.  Not sure how MathJax modifies the display of the MathML in the browser windows.

I've tried all your export

I've tried all your export options and cannot get web output to display math remotely sanely in any browser other than Firefox.

Now what?