Created attachment 747192 [details] Screenshot of problem STR: 1) On a recent UX build, apply a lightweight theme 2) Open up a bunch of tabs 3) Start selecting different tabs The selected tab background looks strange - vertically stretched, I think. See screenshot.
This is a regression from bug 850918 which I fixed in bug 865178. You said in bug 865178 that you could still reproduce this issue with my patch but I can't.
Ah, yes, you're absolutely right. I'd failed to update my local branch with that fix.