Mozilla developers identified and fixed several stability bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these crashes showed evidence of memory corruption under certain circumstances and we presume that with enough effort at least some of these could be exploited to run arbitrary code.
CNet pointed out this was the third update to the browser so far this year and Mozilla has pushed back release of its "Shiretoko" version of Firefox in favor of a fourth beta for Firefox 3 - Version 3.5.
Secunia in March issued a report that said Firefox had more security vulnerabilities last year than Internet Explorer, Safari and Opera together, but Mozilla dealt with the flaws rapidly - faster than Microsoft.
Net Applications shows Firefox has been slowly but surely edging up against Internet Explorer globally. Last May, IE had 73.75 percent of the market and Firefox had 18.41 percent. In March, IE had dropped to 66.82 percent and Firefox had risen to 22.05 percent. Safari and Chrome accounted for the rest of the difference for IE.