Examine source code of A Dark Mode with Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "A Dark Mode with Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(43, 42, 51)",
      "toolbar_text": "rgb(240, 240, 240)",
      "frame": "rgb(28, 27, 34)",
      "tab_background_text": "rgb(200, 200, 200)",
      "toolbar_field": "rgb(28, 27, 34)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 128, 255)",
      "popup": "rgb(43, 42, 51)",
      "popup_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(0, 128, 255)",
      "toolbar_field_highlight": "rgb(0, 63, 128)",
      "toolbar_top_separator": "rgb(43, 42, 51)",
      "toolbar_vertical_separator": "rgb(0, 128, 255)",
      "tab_loading": "rgb(0, 128, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0397922-919e-4e02-a99a-910f85023acc}"
    }
  }
}