I've just noticed that the slippy map within the wmflabs GeoHack page does not work when accessed via HTTPS, and thought I should mention it here.
For example, compare:
http://tools.wmflabs.org/geohack/geohack.php?pagename=Foo%C2%B6ms=10_N_10_E
with
https://tools.wmflabs.org/geohack/geohack.php?pagename=Foo%C2%B6ms=10_N_10_E
Could this be a mixed-content issue involving the script that drives the slippy map not using protocol-relative URLs, or the slippy map tile provider not responding to HTTPS?
Neil