Examine source code of Early IE

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Early IE",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-038-6c77b9d7dc86f50c6cd82f9c9b1f36f0.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(212, 212, 212)",
      "toolbar_text": "rgb(125, 125, 125)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(100, 100, 100)",
      "toolbar_field": "rgb(94, 94, 94)",
      "toolbar_field_text": "rgb(173, 173, 173)",
      "tab_line": "rgb(38, 38, 38)",
      "popup": "rgb(207, 207, 207)",
      "popup_text": "rgb(34, 34, 34)",
      "tab_loading": "rgb(38, 38, 38)"
    }
  }
}