Examine source code of Green Arrows

{
  "theme": {
    "images": {
      "theme_frame": "green_arrows_header.jpg"
    },
    "colors": {
      "frame": "#73ff7a",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Green Arrows",
  "manifest_version": 2,
  "description": "A green background with with black arrows."
}