Examine source code of Copy as-slug

{
  "manifest_version": 3,
  "name": "Copy as-slug",
  "version": "1.0.0",
  "description": "Adds a right-click context menu item to copy selected texts as-slug on a web page",
  "icons": {
    "16": "assets/img/icon-16.png",
    "32": "assets/img/icon-32.png",
    "48": "assets/img/icon-48.png",
    "128": "assets/img/icon-128.png"
  },
  "permissions": [
    "contextMenus",
    "storage"
  ],
  "background": {
    "scripts": [
      "core/background.mjs"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "core/views/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "copy-as-slug@missofis.com"
    }
  }
}