I have just updated Firefox on my desktop. In order to operate it had to disable avast, my open source excellent anti virus software - a surprise that Firefox is compatible! Is there an avast! update that is compatible? Or a fix from Firefox coming?

I prefer using Firefox over other browsers however I will have to switch if there isn't a fix. I am surprised since it is an excellent open source anti virus software.

Don't disable your antivirus software!
Can you explain the problem in more detail? These two issues come to mind:
(1) Avast protects against program changes. When Firefox changed, Avast blocked it, and you do not have an obvious way to approve the change.
(2) One or more Avast browser add-ons has not yet been marked as compatible with Firefox 5, so those add-ons were disabled. However, this has no effect on your protection outside of Firefox.

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