Examine source code of Wall Lit

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxPersona.jpg"
    },
    "colors": {
      "frame": "#1f07d9",
      "tab_background_text": "#09eef2"
    }
  },
  "version": "2.0",
  "name": "Wall Lit",
  "manifest_version": 2,
  "description": "Sunlight reflecting off of cars in the parking lot below my apartment, through my three windows, and onto my wall, then photoshopped and put here"
}