This extension is great! Very convenient.

I use it all the time and the Firefox extension is a plus to this free service.

新着メールお知らせ拡張機能はこちら (for Firefox)の通知音が消えました。
サウンドやポップアップの有無、音量、音の種類などを変更できます。が出来なくなっています

This extension is great! Very convenient. I love that I can sync/log in from different devices and don't lose addresses, can transfer email addresses, and can create unlimited number of addresses.

とりあえず良い

Anonymity is the biggest plus. It gets a 5 star for that. The user interface and email retrieval is not sophisticated, but functional. Japanese language skills are also helpful. A VERY SINCERE THANK YOU TO THE DEVELOPERS.
Minasan, Arigato gosaimashta.