Examine source code of Game Gorilla Alternate

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxPersonaHeaderAlt.png"
    },
    "colors": {
      "frame": "#9c9c9c",
      "tab_background_text": "#c7c7c7"
    }
  },
  "version": "2.0",
  "name": "Game Gorilla Alternate",
  "manifest_version": 2,
  "description": "Game Gorilla Smaller Image"
}