Mixed content errors in 4.0dev12
The rules for wikia.com throw a mixed content error. Some active mixed content are loaded from domains which have no HTTPS support yet.
In rules for puush.me, URLs puush.me/account* and puush.me/gallery/* also cause mixed content error due to 3rd party resources loaded explicitly though HTTP.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information