Very Handy Add-on Rated 5 out of 5 stars
Been using this add-on for a very long time and it has never failed me. Allows multiple accounts to be added from different email accounts eg gmail, hotmail, yahoo and gives you the number of unread emails next to your browser address bar. When clicking on the letter, it automatically opens your email account, no need for signing in.
Thanks dev, made my life a whole lot easier.