I'd say 99.99% IE and the remainder google.
FIREFOX
It seems from the article that using Google is arbitrary, that the flaw could be used to exploit other software as well.
Also, Google will probably have their part of it patched long before IE.
As far as the end user, of course it's their responsibility, ultimately. They shouldn't be using a browser so volatile you can actually hear it ticking.
The liability in these recurring episodes lies strictly with the consumer. There are many alternatives available to consumers to surf the web with relative security. These alternatives are cheaper than MS's solutions and within the technical skill range of most consumers.
Compounding the inherent laziness quotient is ignorance. Ignorance, not stupidity. Two simple rules eliminate most of the threat posed by malware:
1) Don't go where you don't know. Leave the pioneering to pioneers. Surf where it's safe.
2) Treat all personal electronic communication as a potential threat. Handle email and instant messaging with the respect you accord an unloaded firearm. If the magazine is empty, check the chamber before you examine the muzzle.
is desktop any more secure these days and what other program can do the same?