Examine source code of light blue theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "light blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(209, 238, 250)",
      "toolbar_text": "rgb(85, 142, 193)",
      "frame": "rgb(94, 155, 209)",
      "tab_background_text": "rgb(56, 93, 178)",
      "toolbar_field": "rgb(243, 251, 255)",
      "toolbar_field_text": "rgb(90, 132, 207)",
      "tab_line": "rgb(160, 206, 246)",
      "popup": "rgb(90, 152, 207)",
      "popup_text": "rgb(203, 230, 253)",
      "tab_loading": "rgb(160, 206, 246)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2b1b2919-bfe4-4b10-a082-27c6a7dfc1c6}"
    }
  }
}