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Use minus offset for vertical clipping.
After bug 1586144 the area which is initially covered by the dynamic toolbar is outside of the ICB so that we need to use minus offsets. https://bugzilla.mozilla.org/show_bug.cgi?id=1586144
After bug 1586144 the area which is initially covered by the dynamic toolbar is outside of the ICB so that we need to use minus offsets. https://bugzilla.mozilla.org/show_bug.cgi?id=1586144