I don't notice great differences. I am sure it would be possible to make them more similar but it may be quite a bit of hassle depending on what you wish to change.

You did not even post from Firefox. What linux distro ? and version ? and what Firefox build on Linux, Iceweasel, Canonical. Mozilla etc ? also the Firefox version ? and channel ( Release or ESR) ?

Have a look at

• Use themes to change the look of Firefox
• How to Customize Toolbars
• GreaseMonkey https://addons.mozilla.org//firefox/addon/greasemonkey/
  • https://en.wikipedia.org/wiki/Greasemonkey
  • http://www.greasespot.net/
• Stylish addon https://addons.mozilla.org//firefox/addon/stylish/

Firefox on Linux since Firefox 46.0 and newer has required GTK3 themes to theme Firefox as otherwise Firefox may look unthemed if a GTK2 theme is in use for the OS.

Sorry I should have described better. So here you go, screenshot to see the difference I'm talking about.

https://s32.postimg.org/tnr4jumxx/image.jpg

In the left, a virtual machine running SOLUS OS, Firefox version 47.0. In the right side, windows version of Firefox, also version 47.0.

So my question, is it possible to set the linux design in the windows firefox?

Thanks guys.

PS john99, I will take a look at the links you pasted.Thanks man

Fellows problem solved. Just installed Solus OS and figured out it has "Ark Dark Theme" installed. Sorry for the newbie question. Thanks