consider removing Pocket

Firefox 45 ESR includes Pocket client code and UI. We may want to remove it, since it encourages use of a third party service that we do not know much about.

Maybe all we need to do is set extensions.pocket.enabled = false to disable it.

It is also worth noting that for Firefox 46, the Pocket code has been pulled out of the core browser and moved to a system extension (see https://bugzilla.mozilla.org/show_bug.cgi?id=1215694)

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