Examine source code of Space Station Finder

{
  "manifest_version": 2,
  "name": "Space Station Finder",
  "description": "Get the next Space Station viewing time for your location, and clear visualization & sighting instructions.",
  "version": "1.3",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Get Space Station viewing and sighting information"
  },
  "permissions": [
    "activeTab",
    "storage"
  ]
}