Examine source code of Abstract by M♥Donna

{
  "name": "Abstract by M♥Donna",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "3.jpg"
    },
    "colors": {
      "frame": "rgba(88, 163, 59, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(89, 189, 53, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(88, 163, 59, 0.1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{91c99bfd-ce13-45bf-9007-0d7df3c2aede}"
    }
  }
}