I have Mac OSX 10.6.8.
I read these articles:
How to Detect and Protect Against Updated Flashback Malware
Flashback botnet: The end of the Mac’s malware immunity?
Beware the Morphing Flashback Malware
So, I disabled Java in all 4 of my installed browsers. So far I have not noticed any downside.
“Disabling Java will block Flashback’s “drive-by” attack, and is the most effective way for earlier users of Mac OS X to protect themselves.
• Safari—Go to Preferences > Security, and uncheck “Enable Java.” (While you’re in there, go to Preferences > General and make sure “Open ‘Safe’ files after downloading” is unchecked.)
• Firefox—Choose Tools > Add-ons, select the Plug-ins Tab, and click the “Disable” button next to Java Plug-in.
• Chrome — Type chrome://plugins in Chrome’s address bar. A list of available plug-ins will appear. Find Java and click the “Disable” link beneath it.
This doesn’t remove Java from your system, it just prevents Web browsers from launching or running Java apps. That’s enough to protect you from the drive-by nature of the Flashback attack. You’ll still be able to run desktop applications that require Java — a common example is things like Citrix’s GoToMeeting — but you may find you need to selectively re-enable Java in a browser to log in to services or download updates. In that case, you can selectively re-enable Java to get an app running, then disable it again when you’re done.”
I also disabled Java in Opera browser from opera:plugins