Examine source code of Endless Night

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxPersonaHsmaller.png"
    },
    "colors": {
      "frame": "#8d7dd4",
      "tab_background_text": "#7866ed"
    }
  },
  "version": "2.0",
  "name": "Endless Night",
  "manifest_version": 2,
  "description": "The rare night scene of The Endless Forest"
}