Rated 4 out of 5 stars
It looks good but I prefer fullscreen mode. There is no customization except you can give the button where you like it (which is important for me).This review is for a previous version of the add-on (126.96.36.199-signed).
customization -> That come sure!
My firefox addon will receive soon all the features like the Chrome extension:
Take a look on Google Chrome.
Thanks for you feedback!