Examine source code of Kewl 2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Kewl 2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-023-f741aad3989b46322a7840a425068429.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(120, 136, 94)",
      "toolbar_text": "rgb(207, 246, 0)",
      "frame": "rgb(39, 39, 39)",
      "tab_background_text": "rgb(120, 136, 94)",
      "toolbar_field": "rgb(39, 39, 39)",
      "toolbar_field_text": "rgb(207, 246, 0)",
      "tab_line": "rgb(207, 246, 0)",
      "popup": "rgb(39, 39, 39)",
      "popup_text": "rgb(120, 136, 94)",
      "tab_loading": "rgb(207, 246, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b51db6e9-1ef8-4d9f-9fec-6f2ebd683a98}"
    }
  }
}