In addition to an update for Firefox to version 3.5.5 over the last few days, it appears that both Microsoft and Adobe will have patches to apply on Tuesday, December 8. 

http://www.microsoft.com/technet/security/bulletin/MS09-dec.mspx

Microsoft Security Bulletin Advance Notification for December 2009

Looks like the critical updates (see http://www.microsoft.com/technet/security/bulletin/rating.mspx for the definition of critical) apply to the following:

• Internet Explorer 5.01sp4 and version 6sp1

OS versions – Windows 2000sp4, 

• Internet Explorer version 6, 7, and 8

OS versions – XPsp2, sp3 (and XPx64sp2), Server 2003sp2, sp3 (and XP x64sp2),

• Internet Explorer 7 and 8

OS versions – Vista (both 32 and 64 bit) sp1 and sp2

• Internet Explorer 8

OS versions – Windows 7 (both 32 and 64 bit)

• Office project 2000, 2002 and 2003

• Windows server 2008 (base and sp2) for 32 and 64 bit