Examine source code of Green Leaves by M♥Donna

{
  "name": "Green Leaves by M♥Donna",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(60, 107, 45, 1)",
      "tab_background_text": "rgba(211, 255, 36, 1)",
      "toolbar": "rgba(58, 107, 45, 0)",
      "bookmark_text": "rgba(205, 255, 97, 1)",
      "toolbar_field": "rgba(60, 110, 46, 0.12)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c9771671-2419-42f6-a96d-fe36468d6e86}"
    }
  }
}