Examine source code of Proxy Port

{
  "name": "Proxy Port Extension",
  "short_name": "Proxy Port",
  "description": "Secure and Private Browsing with Proxy Port Browser Extension",
  "version": "1.2.1",
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "192": "img/icon192.png"
  },
  "manifest_version": 2,
  "browser_action": {
    "default_icon": "img/icon192.png",
    "default_title": "Proxy Port: Off"
  },
  "background": {
    "scripts": [
      "utils.js",
      "apidriver.js",
      "proxykeeper.js",
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "proxy",
    "tabs",
    "contextMenus",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "notifications",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{06adbb5a-320f-4956-b1fe-a3869bd4e3f5}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}