Since 2014 (T73748) we run the following client side JS script on any page visit
// If MathPlayer is installed we show the MathML rendering. if ( navigator.userAgent.indexOf( 'MathPlayer' ) > -1 ) { $( '.mwe-math-mathml-a11y' ).removeClass( 'mwe-math-mathml-a11y' ); $( '.mwe-math-fallback-image-inline, .mwe-math-fallback-image-display' ).css( 'display', 'none' ); return; }
This is quite a CO2 footprint I guess.
According to @NSoiffer MathPlayer stopped working around IE8. Which is only a tiny fraction of the overall request. Therefore we should decide to disable the feature at some point in time.