Firefox has also other type of extensions. Jetpack extensions ( https://jetpack.mozillalabs.com/ https://jetpack.mozillalabs.com/ ) which don't require restarts

Firefox has also other type of extensions. Jetpack extensions ( https://jetpack.mozillalabs.com/ https://jetpack.mozillalabs.com/ ) which don't require restarts. And there are also "mini themes", called Personas ( http://www.getpersonas.com/en-US/ http://www.getpersonas.com/en-US/ ) which don't require restarts.