Adds unecessary "WHO ASKED YOU?!" functionality Rated 2 out of 5 stars

When you double click a tab, it opens a new tab. It is not documented as a feature, and it is nothing more than an annoyance. Who asked you!?

This review is for a previous version of the add-on (0.3). 

New Tab / Doubleclick

This functionality is actually built into Firefox already.

New Tab Homepage 0.3 had an issue where this behaviour could be triggered while attempting to close a tab if you double-click the X button. 0.4 resolves this, but does not attempt to prevent double-clicking a tab from opening a new tab. If you want to do this, I suggest installing Tab Clicking Options.