spiegel.tv won't work with HTTPS-E enabled
http://www.spiegel.tv/ (online video portal of major German magazine "Der Spiegel") won't play videos if HTTPS Everywhere is enabled. Disabling it from the button doesn't solve the problem, only uninstalling or disabling the extension via Tools > Add-ons does.
Tested and verified in a clean Firefox 23.0.1 profile with only HTTPS Everywhere installed.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information