OpenStreetMap.org-tiles not visible on some websites
The tiles of OpenStreetMap.org are not visible on some websites with https-everywhere enabled. See for example these websites: http://simon04.dev.openstreetmap.org/whodidit/, http://download.geofabrik.de/europe.html. When the rule 'OpenStreetMap.org' has been disabled, the tiles are showed correctly.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information