Rip Firefox Hello Beta / Loop extension in ESR45 based Tor Browser

We should think about getting rid of the Hello/Loop extension. As gacar mentioned (https://lists.torproject.org/pipermail/tor-qa/2016-April/000809.html) it is quite large (1.6 MB) and is probably not running anyway as we are disable WebRTC at compile time and Firefox Hello is not active either.

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