One of the great things about the Firefox browser are the abundant number of add-ons and themes available. Three of my favorites are one called Foxe9 (IE9 clone), FXChrome (Chrome clone), and Australis - the upcoming Firefox 27 makeover. Foxe9 will skin your Firefox browser to look like MS-Internet Explorer 9-10-11 and FXChrome will skin your browser to look like Google Chrome. Below are examples and links where you can get them. Enjoy.
Foxe9
You can download it here:
https://addons.mozilla.org/en-us/firefox/addon/foxe9/
FXChrome
You can download it here:
https://addons.mozilla.org/en-US/firefox/addon/fxchrome/?src=cb-dl-users
Firefox Australis
- The new upcoming look of Firefox 27. You can get it now on Firefox 24/25.
You can get it here:
https://addons.mozilla.org/de/firefox/addon/australis-redesigned-by-ansgar/