Examine source code of Auto Proxy Switcher

{
  "manifest_version": 2,
  "name": "Auto Proxy Switcher",
  "version": "1.0",
  "description": "Automatically switches proxies every few minutes.",
  "permissions": [
    "proxy",
    "storage",
    "alarms",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "applications": {
    "gecko": {
      "id": "proxy-switcher-newambrish@example.com",
      "strict_min_version": "91.1.0"
    }
  }
}