Examine source code of Camo Grayscale

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Camo Grayscale",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(45, 45, 45, 0.35)",
      "toolbar_text": "rgb(210, 210, 210)",
      "frame": "rgb(125, 125, 125)",
      "tab_background_text": "rgb(125, 125, 125)",
      "toolbar_field": "rgba(110, 110, 110, 0.35)",
      "toolbar_field_text": "rgb(180, 180, 180)",
      "tab_line": "rgb(35, 205, 179)",
      "popup": "rgba(27, 40, 45, 0.85)",
      "popup_text": "rgb(140, 140, 140)",
      "button_background_hover": "rgba(35, 205, 180, 0.85)",
      "tab_loading": "rgb(35, 205, 179)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{25fc639e-3e4a-4067-967d-5222a2118d99}"
    }
  }
}