TUMBLR - HTTPS Everywhere v 4.0.3 on Firefox Breaks User-Posted Tumblr Pictures
User posted pictures disappear, leaving only a hyperlink which will not load the pictures (probably the picture "alt" tag). Disabling HTTPS everywhere instantly loads them all, re-enabling instantly removes them. Does not matter whether logged into Tumblr or not. Observed on current Firefox w/HTTPS Everywhere plugin running on Win 7 and Win 8.1.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information