have not been able to complete the synchronization in a month

I am running Firefox version 21.0 on Windows Vista. Here is what I get when trying to synchronize after about 5 tests:

"This connection is Untrusted".

         You have asked Firefox to connect

securely to the services.mozilla.com, but we cannot confirm that your connection is secure.

         Normally, when you try to connect securely,

sites will present a reliable identification to prove that you
go to the right place. However, the identity of this site cannot be verified.

         What Should I Do?

           If you usually connect to

This site without problems, this error could mean that a person is
trying to impersonate the site and you should not continue. »

has begun working ystrdy right after I downloaded an update for an add-on. Don't know if that had anything to do with it, or it was just a coincidence.

Tags: Firefox

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