Firefox fans are going to love this. Bruce Schneier wrote yesterday about a browser study from August that measured
the number of days browsers were known to be unsafe.
The researchers tracked three browsers (MSIE, Firefox, Opera) in 2004 and counted which days they were "known unsafe." Their definition of "known unsafe": a remotely exploitable security vulnerability had been publicly announced and no patch was yet available.
Microsoft's Internet Explorer was 98 percent unsafe; meaning there were only 7 days in 2004 that
didn't have an unpatched publicly known security hole. And that's only publicly known holes.
Firefox was 15 percent (56 days); Opera was 17 percent (65 days).