Examine source code of Proxy Switch

{
  "name": "Proxy Switch",
  "version": "1.2",
  "description": "Proxy Switch is an ultimate proxy manager.Makes it really easy to switch between proxies. Integrates with toolbar and context menu, comes with features like user agents,block webrtc,bypass sites,bandwidth saver and more",
  "browser_action": {
    "default_icon": "img/icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "commands": {
    "change-proxy": {
      "suggested_key": {
        "default": "Ctrl+Shift+O",
        "mac": "Command+Shift+O"
      },
      "description": "Rotate the proxy randomly"
    }
  },
  "permissions": [
    "storage",
    "proxy",
    "privacy",
    "notifications",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "tabs",
    "https://*/*",
    "http://*/*",
    "cookies",
    "history",
    "browsingData"
  ],
  "manifest_version": 2
}