FX uses now since bug 1173730 a solid tab separator on Win10. This bug is to apply this for TB.
Created attachment 8629636 [details] [diff] [review] tabSeparator.patch Simple port to TB.
Created attachment 8644281 [details] [diff] [review] tabSeparator.patch Updated after bug 1180487 became r+ and has c-n. This patch needs to be applied after bug 1180487.
url: https://hg.mozilla.org/comm-central/rev/9924b6cf77371fd5445d2912a7e6813fdf4c21c2 changeset: 9924b6cf77371fd5445d2912a7e6813fdf4c21c2 user: Richard Marti <email@example.com> date: Thu Aug 06 12:40:10 2015 +0200 description: Bug 1180472 - Use solid tab separator on Windows 8 and 10. r=Fallen