With bug 1169981 Windows 10 has it's own media queries. We need to add them to our theme to style TB correctly under Windows 10. Without the non-default theme rules are used.
Created attachment 8616372 [details] [diff] [review] supportWin10.patch Unlikely to FX we need the special queries because we differentiate between Classic/HC, Vista/Win7 and Win8/Win10. FX differentiates only between Classic/HC/Win8/Win10 and Vista/Win7. But this additional query isn't bad as Microsoft said Win 10 would be the last Windows version. After this where are only updates. But we could also think about going the FX way, which is not as good on HC themes, like TB. If we do this, this should be a new bug after this one is closed.
Oops, wrong bug in comment 0. The correct is bug 1166867 and it landed on ESR38. So our bug needs also to land on ESR38.
Created attachment 8617960 [details] [diff] [review] supportWin10.patch Added the fix from bug 1169911 to get rid of the too wide active border on both sides in the titlebar.
Comment on attachment 8617960 [details] [diff] [review] supportWin10.patch Ugh. Large patch. But it looks good… r=me.
Comment on attachment 8617960 [details] [diff] [review] supportWin10.patch [Approval Request Comment] Regression caused by (bug #): 1166867, which is also in mozilla-esr38 User impact if declined: Not correct styling of the default theme Testing completed (on c-c, etc.): awaiting c-i Risk to taking this patch (and alternatives if risky): Low, it's only CSS with media queries.
Comment on attachment 8617960 [details] [diff] [review] supportWin10.patch http://hg.mozilla.org/releases/comm-esr38/rev/08caa558cf7d