Examine source code of Vinyl Blue Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Vinyl Blue Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-034-e0dfa84411058d2e5627f19f1ea501ca.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(27, 145, 213, 0.75)",
      "toolbar_text": "rgb(225, 234, 239)",
      "frame": "rgb(33, 42, 57)",
      "tab_background_text": "rgb(225, 234, 239)",
      "toolbar_field": "rgb(50, 59, 73)",
      "toolbar_field_text": "rgb(225, 234, 239)",
      "tab_line": "rgb(27, 145, 213)",
      "popup": "rgba(33, 42, 57, 0.95)",
      "popup_text": "rgb(225, 234, 239)",
      "button_background_active": "rgb(50, 59, 73)",
      "button_background_hover": "rgb(50, 59, 73)",
      "ntp_background": "rgb(33, 42, 57)",
      "ntp_text": "rgb(225, 234, 239)",
      "toolbar_bottom_separator": "rgba(27, 145, 213, 0.9)",
      "toolbar_field_border": "rgb(33, 42, 57)",
      "toolbar_field_highlight": "rgb(27, 145, 213)",
      "toolbar_top_separator": "rgba(27, 145, 213, 0.9)",
      "tab_loading": "rgb(27, 145, 213)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2d88294f-0601-464f-bb5c-a56f169bf865}"
    }
  }
}