Examine source code of Blueprint V2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blueprint V2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(48, 57, 71)",
      "toolbar_text": "rgb(234, 240, 255)",
      "frame": "rgb(0, 49, 83)",
      "tab_background_text": "rgb(234, 240, 255)",
      "toolbar_field": "rgb(26, 47, 68)",
      "toolbar_field_text": "rgb(234, 240, 255)",
      "tab_line": "rgb(234, 240, 255)",
      "popup": "rgb(26, 47, 68)",
      "popup_text": "rgb(234, 240, 255)",
      "tab_loading": "rgb(234, 240, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cca19fe7-169e-4d78-b495-a7be23e1e7ff}"
    }
  }
}