Examine source code of Reader Mode Toggle

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.0.0",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon.svg",
    "32": "icons/icon.svg",
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "tabs"
  ],
  "commands": {
    "toggle-reader-mode": {
      "suggested_key": {
        "default": "Ctrl+Shift+R"
      },
      "description": "Toggle Reader Mode for the current tab"
    }
  },
  "browser_action": {
    "default_title": "Toggle Reader Mode",
    "default_icon": {
      "16": "icons/icon.svg",
      "32": "icons/icon.svg"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "reader-mode-toggle@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}