User Agent: Mozilla/5.0 (Windows NT 6.3; rv:40.0) Gecko/20100101 Firefox/40.0 Build ID: 20150826023504 Steps to reproduce: 1. Press F11 to enable fullscreen mode. Actual results: The current icons (minimize, restore, close) in button area have "Windows 7 appearance" and are minimized, when fullscreen mode is enabled. Expected results: Minimize, restore and close buttons in fullscreen mode in Windows 8/8.1 and 10 should: a) have a new "Windows 10" appearance (suggested look: http://imgur.com/wDgyGRO), b) be "full-sized" and not minimized (the same size as in normal, non-fullscreen mode). However the current appearance matches well with older Windows versions, so they could remain that way on Windows 7 and lower.