Rated 2 out of 5 stars

its also possible to change this setting in "About:config" without addon !

This review is for a previous version of the add-on (0.2.1-signed.1-signed). 

I acknowledged that in the description. But some people would rather have an addon, apparently. People have been complaining about MRTech's extension not working in Firefox 4, so obviously not everyone wants to edit their about:config.