Gecko is short circuiting .xpi links. Is GV ignoring some XPI install event from Gecko?
Bug 1571314 Comment 1 Edit History
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Gecko might be short circuiting .xpi links or GV might be ignoring some XPI install event from Gecko. But downloading untrusted third-party extensions in Fenix is a very low priority since Fenix+GV doesn't even support installing extensions from AMO yet.