X-notifier (for Gmail,Hotmail,Yahoo,AOL ...) 3.5.6
Notifier for gmail, yahoo, hotmail, aol and more webmails.
X-notifier(aka WebMail Notifier) checks your webmail accounts and notifies the number of unread emails...
Supports : gmail, yahoo, hotmail, POP3/IMAP, facebook, twitter and more
This add-on is not compatible with your version of Thunderbird because of the following: