Examine source code of Cool Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Cool Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-007-ea06061a8f8be943739a27dace8dc532.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(73, 167, 186)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 24, 210)",
      "tab_background_text": "rgb(215, 226, 239)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(255, 0, 225)",
      "popup": "rgb(18, 24, 76)",
      "popup_text": "rgb(215, 226, 239)",
      "tab_loading": "rgb(255, 0, 225)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a25cbe5d-7a5a-44f3-8146-ce133dc87095}"
    }
  }
}