One nice element that can really bring a Firefox theme together is a themed scrollbar. Lucky for you, this is already read to go in iPox Remix.

Simply open the global folder and inside you’ll find scrollbar.css and a scrollbars folder. The scrollbar folder contains all the pieces. I don’t believe the hover states are used but I put them in anyways. All pieces are pretty much self explanatory. Just open them up and edit the images. For the most part, scrollbar.css doesn’t need to be edited at all. However, if you feel you need to make modifications to the scrollbars, outside of the imagery, then this is where you’d do it.