Examine source code of Son Set Proxy v2

{
  "name": "Son Set Proxy",
  "version": "1.0.1",
  "manifest_version": 2,
  "permissions": [
    "browsingData",
    "proxy",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "downloads",
    "notifications",
    "<all_urls>",
    "activeTab",
    "tabs",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "vanson@hongtin.net"
    }
  },
  "browser_action": {
    "default_icon": "son.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "son.png"
  }
}