Examine source code of Between the years Darker

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Between the years (Darker)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-026-829b05416f823e170310e7c826ad1bec.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(43, 41, 39)",
      "toolbar_text": "rgb(194, 233, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(194, 233, 255)",
      "tab_line": "rgb(188, 171, 255)",
      "popup": "rgb(43, 41, 39)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgb(194, 233, 255)",
      "tab_loading": "rgb(188, 171, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7c725b4d-c95e-4899-b235-96b6e80c7950}"
    }
  }
}