Exposed chrome:// resources allow browser version and OS detection [Bug 1534581]
The default permissions defined in the chrome.manifest file allow specific paths to be called from any web page. For example, chrome://browser/content/* or chrome://global/content/*.
For references see https://bugzilla.mozilla.org/show_bug.cgi?id=1534581
Trac:
Username: flngerprlnt
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information