Customisability is one of the biggest assets of Firefox. You can change the look and feel of Firefox or even add new functionalities to it. I am sure every Firefox user is aware of Firefox Themes. However, there is another alternative to skinning Firefox that not many people are aware of – Firefox Persona.
Firefox Persona is an extension from Mozilla Labs that allows users to skin Firefox on the fly. Once installed, you can select any theme from the gallery or from the extensive list provided by the Persona menu. Since the themes are extremely small they are applied instantly and without requiring browser restart. Persona offers true personalization since it makes it ridiculously easy to create new skins. All you have to do is specify the header and footer images along with text colour. Persona ensures that everyone can create their own skin; all you need is some imagination.
If you hate how bloated and over the top most themes are and feel that installing themes is too much of a hassle give Persona a try. Persona may be just what you were looking for.