Created attachment 8775460 [details] See the red dot line at the right side of Downloads Panel The redundant line can be addressed with this query: panelmultiview#downloadsPanel-multiView vbox.panel-subviews If vbox.panel-subviews is given 'display: none', the line is gone. Reproduced on Windows 7, Windows 10.
Created attachment 8775481 [details] more clear screenshot The red-dot line in attachment 8775460 [details] is for indicating the dom object in DevTools. Please see "White Line" in this attachment.
Thanks! Looks like a duplicate of bug 1288730? It landed only recently, so it's possible the fix is not in your local copy yet.
Can you still reproduce this on the latest Nightly build?
Hey Jared, this issue can't be reproduced now. Based on comment 2, this bug is duplicate.