Examine source code of Leafy Greens

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Leafy Greens",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(0, 255, 0)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(31, 143, 19, 0.27)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(21, 102, 13)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(0, 0, 0)",
      "popup_border": "rgb(54, 169, 43)",
      "popup_highlight": "rgb(54, 169, 43)",
      "sidebar_border": "rgb(0, 0, 0)",
      "sidebar_highlight": "rgb(54, 169, 43)",
      "tab_loading": "rgb(21, 102, 13)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bca59f1a-b801-4dbb-88fe-3fab6ebbecfe}"
    }
  }
}