DanTMan wrote:
Also remember that 100% of all extensions add
themselves to the list of
extensions. So it's possible for some custom extensions to exist which
are not listed on [[Special:Version]] of some wiki.
Erm, Daniel meant that *NOT* all extensions add themselves there.
Extensions not listed are usually old (before they could be) and given
that extensions at wikimedia wikis are quite mantained i think you can
mostly rely on it.
Also, there're configuration options not listed on Special:Version, like
namespace names, programs for uploads (file, convert...), tidy (enabled
on wmf wikis)...
If you want to sneak into the wikis config, you can see an old version
of them at
http://noc.wikimedia.org/conf/