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Square back button missing
With 1.5.1 update, the navigation bar height at 30 px or below results in a back button with no back arrow visible; the button is just a blank gray. Using Ubuntu 16.04, Firefox 54.0.
Affects me too, Firefox ESR 52.2.0 64 bit from firefox-esr_52.2.0esr-1~deb9u1 .deb