Examine source code of linux mint greenbar

{
  "name": "linux mint green",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "linux mint firefox.png"
    },
    "colors": {
      "frame": "rgba(46, 46, 46, 1)",
      "tab_background_text": "rgba(255, 252, 252, 0.98)",
      "toolbar": "rgba(46, 46, 46, 0.03)",
      "bookmark_text": "rgba(255, 255, 255, 0.99)",
      "toolbar_field": "rgba(32, 89, 98, 0.02)",
      "toolbar_field_text": "rgba(245, 242, 242, 0.96)",
      "tab_line": "rgba(15, 15, 15, 0.98)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{56c8d0d8-3c6c-43c8-93f9-b917f79c77e7}"
    }
  }
}