Examine source code of ReLink

{
  "manifest_version": 3,
  "default_locale": "en",
  "name": "ReLink: Summarize & Listen",
  "version": "1.0.5",
  "description": "Turn Your Links into Audible, Interactive Summaries",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "src/pages/background/index.js"
    ],
    "type": "module"
  },
  "action": {
    "default_icon": {
      "19": "icons/relink-19x19.png",
      "34": "icons/relink-34x34.png",
      "38": "icons/relink-38x38.png",
      "48": "icons/relink-48x48.png",
      "128": "icons/relink-128x128.png"
    }
  },
  "icons": {
    "19": "icons/relink-19x19.png",
    "34": "icons/relink-34x34.png",
    "38": "icons/relink-38x38.png",
    "48": "icons/relink-48x48.png",
    "128": "icons/relink-128x128.png"
  },
  "content_scripts": [],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/js/*.js",
        "assets/css/*.css",
        "icon-128.png",
        "icon-34.png"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "options_ui": {
    "page": "src/pages/options/index.html",
    "browser_style": false
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hi@re.link"
    }
  }
}