I love the Dracula Theme but felt the official one for Firefox needed more of the other colors in the palette and somehow ended up with something that reminds me of Cesar Romero's Joker. I enjoy it and hope you do as well. I added transparency on the popups, so if there's any issues with visibility please email me and I will gladly make a version that fixes that for you. Keep an eye out for other themes and extensions by me as I will be making more soon. I consider myself a customization junkie and am developing a few more themes as well as add-ons for functionality that I would like to see in my browser.
