Examine source code of Comfortable E

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Comfortable E",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-021-775b159da029a74f5c76e835cd65e9dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(7, 50, 84)",
      "toolbar_text": "rgb(252, 249, 100)",
      "frame": "rgb(254, 252, 177)",
      "tab_background_text": "rgb(7, 50, 84)",
      "toolbar_field": "rgb(7, 50, 84)",
      "toolbar_field_text": "rgb(252, 249, 100)",
      "tab_line": "rgb(252, 249, 100)",
      "popup": "rgb(254, 252, 177)",
      "popup_text": "rgb(38, 72, 102)",
      "tab_loading": "rgb(252, 249, 100)"
    }
  }
}