Examine source code of Firefox Comic Book Black

{
  "theme": {
    "images": {
      "theme_frame": "firefoxpersonacartoonfoxbanner1black.png"
    },
    "colors": {
      "frame": "#fff30d",
      "tab_background_text": "#fff30d"
    }
  },
  "version": "2.0",
  "name": "Firefox Comic Book Black",
  "manifest_version": 2,
  "description": "Firefox in comic book style with a black background."
}