This is an extension for the Gmail POP3 Fetcher tool. It will check for new emails every minute. If there are new emails, they will be fetched and the icon will be updated. There is no need to do anything else. You can check the account activity from your Gmail account. It works as an automated process.

Gmail POP3 Fetcher

This Extension will automate fetching emails from 3rd party server to your Gmail every minute.

If you use Gmail's previously mentioned Mail Fetcher tool to grab email from other POP3-enabled email accounts, you may have noticed that it sometimes checks for new mail at very slow intervals—particularly if you're importing from a mostly inactive account.