Examine source code of Simple Bold

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Simple Bold",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(3, 3, 3, 0)",
      "toolbar_text": "rgb(135, 132, 132)",
      "frame": "rgb(220, 220, 220)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(220, 220, 220)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(15, 181, 213)",
      "popup": "rgb(240, 237, 237)",
      "popup_text": "rgb(95, 92, 92)",
      "tab_loading": "rgb(15, 181, 213)"
    }
  }
}