I have been wondering about people writing things like
$H(X) = \sum -p_i\ log_2 p_i$ all the time, until I figured out – with the help of a more web2.0-affine friend – that this is Teχ (I'm a nroff guy personally so I didn't recognise it) and rendered by something called MathJax.
Unfortunately, even after enabling
mathjax.org in RequestPolicy, this does not work – FireBug shows how:
Laden von gemischten aktiven Inhalten "http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML" wurde blockiert.
(Sorry for the German – I normally use Lynx and am a mere user here, and have no idea how to get it to use the English I normally also prefer in IT.) Translation:
Loading of mixed active contents "$url" was blocked.
The cause here is obvious: SE (URI exemplary) uses
https, of course – since I am logged in – but requests the ECMAscript from an
http-only URI. (I did try accessing it via
https but only got a response from a server with a certificate for
a248.e.akamai.net, so this wouldn't work even if SE were to use an
The https-everywhere plugin sends the stackexchange session to https, which is the right thing to do since I’m logged in.
So… what to do?
meta.crypto.stackexchange.com is also not covered by the certificate… but I permitted that, for now.