Starting with today's Linux nightly, the tab bar's scroll buttons are too narrow. The arrow seems to overflow the button. I suspect this is a regression from bug 585069.
(In reply to Dão Gottwald [:dao] from comment #0) > I suspect this is a regression from bug 585069. The first bad revision is: changeset: 73928:7fece42cb99a user: Neil Deakin <firstname.lastname@example.org> date: Fri Aug 05 15:24:24 2011 -0400 summary: Bug 585069, support ratio scaling for xul images, r=dbaron
Should be fixed by 677091.