The grey triangles to denote a folder in the left sidebar in Library turn black when another folder is clicked on. If the mouse is moved over a row with a black triangle, the triangle changes to grey. To reproduce: History -> Show All History Close History and All Bookmarks (so triangles point to the right). Click on History. Click on All Bookmarks. History and All Bookmarks should now have black triangles.
Just tried with latest Firefox nightly (60) on Mac. When a folder is not selected the triangle remains grey, when the folder is selected the triangle turns white. There's no black triangles to be seen, so I guess this got fixed at some stage -> WFM.
Status: NEW → RESOLVED
Last Resolved: 8 months ago
Resolution: --- → WORKSFORME
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