When I switch my main Firefox window between my hidpi screen and my regular-dpi screen, a line appears below the title bar. This line disappears if I resize the Firefox window, though. Screenshot in URL.
Does this happen with a current UX-branch nightly build? The reason I ask is that current UX-branch builds always draw in the titlebar, which allows the fix for bug 676241 to come into play. You can achieve the same effect in a mozilla-central nightly by loading a "lightweight theme" in the Add-ons Manager.
Yes, it still happens in UX nightly. Slightly differently: http://i.imgur.com/Dv9Q1Ds.png
Assignee: nobody → mstange
QA Contact: mstange
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