nonstandard behavior Rated 3 out of 5 stars

A tab without history (which have not the Back option) will be closed when I click by middle button on an "empty" space. And this can't be disabled.
So, when I do multi-clicking to go to the root or simply to go back several webpages, THE TAB UNENSPECTIDLY CLOSED!
When I want to close a tab, I middle-click the tab's header!

So, please, disable the such nonstandard behavior by default. Tabs should not to be closed by clicking on webpages.

This review is for a previous version of the add-on (2.7.1-signed). 

New version is "Awaiting Full Review" by Firefox team.
In this version, you can customize what middle-click does.
Beta version is here: