Yes, lack of awareness was definitely a major contributor to lack of usage. See my other comments on this post for more on that topic. Firefox for Metro has b

Yes, lack of awareness was definitely a major contributor to lack of usage. See my other comments on this post for more on that topic. Firefox for Metro has been a testbed for graphics/scrolling/touch technology that we want to eventually land in Firefox for desktop. Things like off-main-thread compositing were enabled in Windows Metro before Windows desktop because (a) responsive scrolling and zooming is more critical in a browser designed for touch, and (b) supporting it just in the new Windows 8 environment requires less development and testing than supporting it across all the desktop OS versions where Firefox runs (and integrating it into existing graphics and input code for those platforms). But it should all make its way into the desktop version eventually.