Question

this connection is untrusted appears in youtube

this connection is untrusted keep appears in youtube ,when i open youtube the advertisement become this error msg ,and cannot click ,no option. when i start firefox, keep pop up checking your add-ons msg ,i don't know how to disable it , it annoying.i don't know it have a connection or not,but all the problem appears after i install avast free antivirus,i use firefox 18.0.1.

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