I can confirm that this problem exists across multiple sites with Firefox. I have the Yahoo-no-image problem on both Windows XP 32 bit and Windows 7 64 bit. Likewise, flash plugins are also blocked. This just started today. Disabling the HTTPS scan does not fix the blocking of flash plugins. I suspect that the last Avast update has some crippling, inherent incompatibility with Firefox. I have used Avast for 10 years and whenever a bugged update occurs, these kinds of system-breaking issues occur. This needs attention and, at the very least, some sort of rollback needs to happen to allow the devs to find and locate what is causing this problem. I do not like the idea of being forced to use IE for browsing and I REFUSE to use the resource hog known as Chrome. This obvious bug needs to be fixed.