Examine source code of DevHeader

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "version": "0.1.0",
  "description": "__MSG_appDescription__",
  "default_locale": "en",
  "permissions": [
    "declarativeNetRequest",
    "declarativeNetRequestWithHostAccess",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "lib/i18n.js",
      "lib/storage.js",
      "lib/dnr-builder.js",
      "background/service-worker.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "DevHeader",
    "default_icon": {
      "16": "icons/16.png",
      "48": "icons/48.png",
      "128": "icons/128.png"
    }
  },
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "options_ui": {
    "page": "welcome/welcome.html",
    "open_in_tab": true
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "devheader@local.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}