Close Rated 4 out of 5 stars

I love this Extension. and with a very simple tweak, you can have your [X] button back.

The site mentioned is in Japanese so i did some playing around...
I have changed the .css file that comes with the extension, this means updates will overwrite it!

Change size to 52px
Change 'None' to -moz-box1

You'll get your close button back, at the expense of.. loosing it again on updating this add-on & you get a few dots on un-focused tabs.

EDIT:
re this request:
Would be great if it came with an animated icon to show when my gmail receives a message.

Gmail changes its own icon to blue for unread messages. You could also get gmail notifier that pops out a message and has an unread count next to it.

This review is for a previous version of the add-on (0.9.7.5).