Rated 5 out of 5 stars

Finally, bringing back standard "middle click last tab exits window". Why this was disabled in the first place is beyond me, and it has been driving me crazy ever since. This is the first extension that actually works as says (as of FF 29.0.1)

This review is for a previous version of the add-on (0.0.5.1-signed.1-signed). 

Thank you for generous review!

To be fair, however, there are at least two, much fancier alternatives that enable "middle click last tab exits window" and predate my extension (first released 2012):

Tab Mix Plus (first released 2005!)
https://addons.mozilla.org/en-US/firefox/addon/tab-mix-plus/
The premier Tab extension, with >1M users! This was way too fancy for my taste, changing too much default Firefox behavior.

Last Tab Close Button (first released 2009)
https://addons.mozilla.org/en-US/firefox/addon/last-tab-close-button/
This, however, doesn't work right with "about:newtab"?

Also, both of these require a browser restart when enabled/disabled.