Opera ブラウザ が必要です。
ライセンス
Character & Word Counter — End User License Agreement Copyright © 2026 Character & Word Counter. All rights reserved. This extension is provided to help users count characters and words directly in the Opera browser. Users may install and use the extension for personal, educational and professional purposes. Unauthorized redistribution, resale, modification or commercial sublicensing of the extension is not permitted without prior written permission from the copyright holder. The extension is provided "as is", without warranties of any kind, to the extent permitted by applicable law. Users are responsible for their own text content and for reviewing their text before using or sharing it. This agreement does not override applicable law or the Opera Add-ons Terms and Conditions.