Mozilla followed up its Firefox 9 release earlier this week with an update aimed at swatting a bug causing browsers to crash. The fix was issued Wednesday with Firefox 9.0.1, and addresses the issue for users across Mac, Windows and Linux. The source of the problem appears ironically to have been a faulty bug fix included in Firefox 9. The update came roughly 24 hours after the company released Firefox 9 with fixes for several vulnerabilities, including a number of hazardous bugs outlined in four critical security advisories.
Source: https://threatpost.com/mozilla-fixes-firefox-9-crash-issue-update-122411/76031/