Examine source code of GESIS Surf

{
  "manifest_version": 3,
  "name": "GESIS Surf",
  "version": "2.5.2",
  "description": "GESIS Surf ist eine wissenschaftliche Untersuchung zur Erforschung des Online-Verhaltens der Menschen in Deutschland.",
  "permissions": [
    "storage",
    "tabs",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.iife.js"
    ]
  },
  "action": {
    "default_popup": "popup/index.html",
    "default_icon": "icon32.png"
  },
  "icons": {
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "<all_urls>"
      ],
      "js": [
        "content/index.iife.js"
      ]
    },
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "<all_urls>"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content/index.iife.js",
        "content/logo.svg",
        "content.css",
        "icon128.png",
        "icon32.png"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "surf@gesis.org"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}