Rated 2 out of 5 stars

per Maverynthia el gen. 30, 2011 ·

I had to downgrade this add-on from 6.3 to 6 because they added a non-optional new mail pop-up. Annoying features should always be optional.

This review is for a previous version of the add-on (0.6.2). 

per Todd Long (desenvolupador) a gen. 31, 2011 ·

This feature is optional and always has been. Please take time to explore the available options.

Options > Accounts > Notifications > "Display snippets when new mail is received." (uncheck this option)