Fix #2049, catch mousedown aggressively so that pointer-events: none doesn't cause text selection
Fix #2049, catch mousedown aggressively so that pointer-events: none doesn't cause text selection

mozilla-services/screenshots,mozilla-services/pageshot,mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/screenshots,mozilla-services/pageshot