Eliminate double tooltips
eMatrix currently shows two tooltips: one is generated by eMatrix's buttons and explains what that button does; the other simply says "eMatrix" and is generated by XUL.
Since the XUL tooltip is displayed above the eMatrix tooltip, useful informations are hard to read.
Investigate wether it's possible to eliminate the XUL tooltip, or, if not, devise a method to use XUL/HTML tooltips for eMatrix descriptions.