The original for bug 888353 (attachment 829826 [details] [diff] [review]) added a "click" listener in Content.js, but for some reason this received only left-click events (button == 0). We should figure out why middle-click events were not received, and move that code back to Content.js.
Whiteboard: [feature] p=0 → [feature] p=3
clearing all of these sp they don't show up in the p1/p2 list until dependent work is complete.
Priority: P2 → --
Mass tracking-e10s flag change. Filter bugmail on "2be0fcce-e36a-4e2c-aa80-0e3d33eb5406".
Mass close of bugs in obsolete product https://bugzilla.mozilla.org/show_bug.cgi?id=1350354
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