Examine source code of Email Tag Autofill

{
  "manifest_version": 3,
  "name": "Email Tag Autofill",
  "version": "1.0.0",
  "description": "Automatically suggests tagged email addresses (email+SITENAME@domain.com) when filling email fields",
  "browser_specific_settings": {
    "gecko": {
      "id": "email-tag-autofill@extensions.maxbezemer.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_page": "options.html",
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}