Hi, maybe this problem's been here since forever but I've noticed it now that I'm using Windows 10. I have Firefox 40 and the close, maximize and minimize buttons do not follow the system settings. I have changed the size of the titlebar to 8 (from default of 9 I believe): http://i.imgur.com/ywNuobB.png And as you can see Firefox ignores this and uses the default value thus making those buttons bigger than they should, pic for comparaison: http://i.imgur.com/sLccmk6.png Also the tab sizes and text seems too big in comparison with Edge. AFAIK I don't have any extension that may produce this problem so I do believe this is a bug. Any plans on fixing it? Any suggestions on how I can fix it myself with an addon or some config settings?