Rated 4 out of 5 stars

A handy, simple extension -- does one thing and does it well. Especially great for anyone using a lower-res display where the message pane doesn't get a lot of real estate!

I agree with others about the "Quit" button on the toolbar. I don't like it -- I never, ever would want to quit Thunderbird from the slideshow window, and the chance of accidentally clicking is too high considering its similarity to the close button immediately adjacent.

A preference to disable Quit would be nice, but as a workaround you can hide the button. Add the following to your profile's userChrome.css (mozilla.org's documentation has info on userChrome.css if you aren't familiar):

#button-exit.toolbarbutton-2 { display: none !important; }

This review is for a previous version of the add-on (1.1).