Add we have disappeared since new Mozilla updated today, help

Since the new Mozilla update this morning, all except two Add - ons have disappeared, not even listed in my Add On more. Not only disabled, but disappeared. No previous version has been saved when updated Itoday!. Is it possible to retrieve the list of the add-on?
System Windows 7
Thank you

You use Avast 2015? If so, see the following articles:
http://www.gHacks.NET/2014/10/31/avasts-HTTPS-scanning-interferes-with-Firefox-and-other-programs/
http://www.gHacks.NET/2014/11/16/latest-avast-reportedly-deleting-Firefox-Add-ons/

Tags: Firefox

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