Examine source code of Blue

{
  "manifest_version": 2,
  "version": "1.3",
  "name": "Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(11, 55, 123, 0.9)",
      "toolbar_text": "rgb(245, 245, 245)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(221, 218, 218, 0.9)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgba(11, 55, 123, 0.9)",
      "popup_text": "rgb(192, 192, 192)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bac229c3-da0e-40e0-91ea-55f9d1e89d57}"
    }
  }
}