Examine source code of Inked Birds

{
  "name": "Inked Birds",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "birds2.jpg"
    },
    "colors": {
      "frame": "rgba(216, 216, 218, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(215, 215, 219, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(215, 215, 219, 0.08)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  }
}