Examine source code of RainProxy

{
  "manifest_version" : 3 ,
  "name" : "RainProxy",
  "short_name" : "RainProxy",
  "version" : "7.1.0",
  "description" : "Sign in with your RainProxy account, pick a location and connect your browser in one click.",
  "icons" : {
    "16" : "icons/icon-16.png",
    "32" : "icons/icon-32.png",
    "48" : "icons/icon-48.png",
    "128" : "icons/icon-128.png"
  },
  "action" : {
    "default_title" : "RainProxy",
    "default_popup" : "popup.html",
    "default_icon" : {
      "16" : "icons/icon-16.png",
      "32" : "icons/icon-32.png"
    }
  },
  "permissions" : [
    "proxy" ,
    "storage" ,
    "webRequest" ,
    "webRequestBlocking" 
  ],
  "optional_permissions" : [
    "privacy" 
  ],
  "host_permissions" : [
    "<all_urls>" 
  ],
  "content_scripts" : [
    {
      "matches" : [
        "https://dashboard.rainproxy.io/*" 
      ],
      "js" : [
        "content-dashboard.js" 
      ],
      "run_at" : "document_idle" 
    }
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@rainproxy.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "websiteActivity"
        ]
      }
    }
  }
}