Rewrite E4X cooke storing+parsing code
Firefox 15 deprecates support for E4X, which we use in Torbutton to read and write protected cookies and maybe for some other stuff too. We need to rewrite that code to use xpath, JXON, or DOM manipulations.
HTTPS-Everywhere chose DOM manipulations. See #5893 (moved).
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information