Examine source code of bushtuber

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "bushtuber",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 121, 74)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(172, 163, 161)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 145, 74)",
      "tab_line": "rgb(184, 9, 64)",
      "popup": "rgb(52, 57, 80)",
      "popup_text": "rgb(152, 150, 147)",
      "tab_loading": "rgb(184, 9, 64)"
    }
  }
}