Examine source code of Stats Navigator

{
  "manifest_version": 2,
  "name": "Stats Navigator",
  "description": "Linking between Baseball-Reference, Baseball Savant, Fangraphs, and Baseball Prospectus",
  "version": "1.6.1",
  "browser_action": {
    "default_icon": "statsNavigator.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{be56a49e-cbf4-48b7-a0f1-a5eaf67cbb17}"
    }
  }
}