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).
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https://developer.mozilla.org/en-US/docs/E4X says we've got until Firefox 17! Woo hoo. That's like a million months from now. However, that is also the next ESR release, so if we don't get this done before then, we're going to be extra sad.
Trac: Keywords: MikePerry201208 deleted, MikePerry201210 added Priority: major to critical