Examine source code of Reading Tree by M♥Donna

{
  "name": "Reading Tree by M♥Donna",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Reading Tree.jpg"
    },
    "colors": {
      "frame": "rgba(36, 40, 25, 1)",
      "tab_background_text": "rgba(254, 255, 235, 1)",
      "toolbar": "rgba(37, 41, 25, 0)",
      "bookmark_text": "rgba(254, 255, 235, 1)",
      "toolbar_field": "rgba(37, 41, 25, 0.07)",
      "toolbar_field_text": "rgba(254, 255, 235, 1)",
      "tab_line": "rgba(255, 252, 153, 1)"
    }
  }
}