Examine source code of PoE Overlay Dash v2

{
  "manifest_version": 2,
  "name": "PoE Overlay Dash",
  "version": "1.0",
  "description": "Connect your pathofexile.com session with PoE Overlay.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "cookies",
    "https://www.pathofexile.com/"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{11fc6616-ee8c-401b-9802-65e78f5a0cfe}"
    }
  }
}