Does anyone know if this works with Konqueror browser?
Here's my test report: I'm on Ubuntu Linux as operating system. Works partially on Gecko Browsers (the colors and transparency don't work as expected, see screenshots), that is FF3.0.4, Epiphany 2.2.2 and Galeon 2.0.4. Doesn't work at all in Dillo 0.8.6 and Netsurf 1.1 (which is to be expected, as those are not DOM compliant browsers). Doesn't work at all in Opera 9.2.7 (see screenshot).
Konqueror is the KDE default browser, but in the end it is using similar rendering engine as the browsers I tested with, so the test result probably will be the same: will work partially. After all, this mod is basically for IE and will sort-of work in all other browsers, especially the less known ones on "exotic" operating systems. But after all, this is just eye candy, so it won't hurt too much if it doesn't work fully on browsers that your target audience probably doesn't use.