Examine source code of PageInfo

{
  "manifest_version": 2,
  "name": "PageInfo",
  "version": "1.0",
  "description": "Retrieve current page info as OrgMode format.",
  "homepage_url": "https://github.com/jay1803/pageinfo",
  "icons": {
    "48": "icons/pageinfo-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/pageinfo-32.png",
    "default_title": "Pageinfo",
    "default_popup": "popup/app.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{46c067da-41a7-4229-9411-40e5902e5e9d}"
    }
  }
}