We currently have a Components shim object exposed to web pages which
has an "interfaces" property. This exposes various nsIDOM* properties
that map to corresponding WebIDL interface objects. Only interfaces
with constants on them are exposed.
We have had a deprecation warning and telemetry for this for a while.
Currently usage stands at about 0.07% of pageloads, 0.015% of documents,
0.66% of browsing sessions. That's low enough that it might be worth
trying to remove this thing.
I just checked in https://bugzilla.mozilla.org/show_bug.cgi?id=1448048
to add a pref for it and turn the preff off on nightly, so we can get
some compat data.
-Boris
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