[Go Faster] Intent to ship: system add-on update to reduce e10s add-ons exposure on 51 and 52

Felipe Gomes fgomes at mozilla.com
Mon Mar 20 17:49:58 UTC 2017

Firefox 51 and 52 shipped with a whitelist of addons that are not marked as
mpc=true, but nonetheless were tested on Beta and deemed relatively safe to
activate for users, and so we did it.
However, telemetry and crash-stats is showing that it's probably a better
idea to revert that, and that's what this update will do: revert to e10s
being only activated for webextensions or addons explicitly marked as

(The same change will be made on beta to ride for 53)

This is tracked on bug https://bugzilla.mozilla.org/show_bug.cgi?id=1344345
and the addon is signed and ready to be tested.

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