Examine source code of Mailto Clipper

{
  "manifest_version": 3,
  "name": "__MSG_extension_name__",
  "short_name": "MailtoClipper",
  "version": "1.0.0",
  "description": "__MSG_extension_description__",
  "author": "Davor Ornik",
  "default_locale": "en",
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "icons": {
    "16": "src/icons/icon-16.png",
    "32": "src/icons/icon-32.png",
    "48": "src/icons/icon-48.png",
    "128": "src/icons/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "MailtoClipper@ornik.si",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    }
  }
}