X-notifier for GmailHotmailYahooAOL is a powerful add-on designed for Firefox that efficiently checks multiple webmail accounts, notifying users of unread emails. Supporting a variety of services including Gmail, Yahoo, Hotmail, AOL, and several others, it allows seamless management of notifications from different providers. Users can easily monitor multiple accounts from the same host, enhancing their email management experience.

The latest version, X-notifier 4.0, has undergone significant internal changes that affect user script support. However, it still accommodates various social media and email platforms through user scripts, including Facebook, Twitter, and LinkedIn. For users wishing to track additional webmail providers, there is an option to create custom scripts. X-notifier is a free tool that simplifies email notifications, making it a valuable asset for users who manage multiple webmail accounts.