Examine source code of Blue Light

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Blue Light",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(237, 237, 237)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(35, 63, 90)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgba(255, 255, 255, 0.78)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{11ab1ce3-54c9-4997-a478-90c9960fc172}"
    }
  }
}