Examine source code of Extra Blue Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Extra Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-038-6c77b9d7dc86f50c6cd82f9c9b1f36f0.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(12, 120, 193)",
      "toolbar_text": "rgb(109, 52, 64)",
      "frame": "rgb(52, 130, 176)",
      "tab_background_text": "rgb(149, 128, 134)",
      "toolbar_field": "rgb(151, 195, 184)",
      "toolbar_field_text": "rgb(133, 135, 164)",
      "tab_line": "rgb(30, 30, 30)",
      "popup": "rgb(0, 255, 28)",
      "popup_text": "rgb(40, 41, 117)",
      "tab_loading": "rgb(30, 30, 30)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4cf08c92-162b-4f50-a999-b73430bb49f7}"
    }
  }
}