Correct colour of LaTeX equations against the Classic Black theme (Opera/Firefox)

If you use the dark theme you may have noticed that equations in posts made by certain users are virtually illegible.


To correct this, here are two userscripts, one for Opera and another for Firefox (requires Greasemonkey). The lower half of the above screenshot shows the result of the fix; the equations should be coloured according to the current font colour rather than the default black.