bad certificate - what do I do
I am receiving the Secure Connection Failed for www.google.com. Your certificate contains the same serial number as another certificate issued by the certificate authority. Please get a new certificate containing a unique serial number. (Error code: sec_error_reused_issuer_and_serial). I checked the certificate and it states the certificate cannot be verified because the date has expired. It is dated 3/14/2014. However all the certificates under this "UserTrust" Network have the same expired date; for example Yahoo and it still works. Following one older Mozilla doc, I deleted it tried it again got the same message. Checking cert. mgr. showed the same cert. moved from "Servers" to "Others". Note that all of them under USERTRUST say this cert. could not be verified because they are all untrusted. After more checking all of the certs. in the certificate mgr. under "servers" are all untrusted!!! I ran MalwareBytes and do not believe it is any malware due to the fact I can run Chrome and it works fine. Could I just delete all certs. in the UserTrust Network? Or all of them? Would Firefox or Google rebuild the cert. I need properly?
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It sounds as though you are not getting the "real" Google certificate...
Do you connect through a proxy server?
Do you use ESET security software? Its feature of scanning your SSL connections has been linked to this particular error code in the past. Do you want to try disabling SSL scanning in ESET and see whether that resolves it: http://kb.eset.com/esetkb/index?page=content&id=SOLN3126 If that works, there might be a problem of duplicate ESET certificates in Firefox's certificate store. It should be fixable.
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Kiválasztott megoldás
It sounds as though you are not getting the "real" Google certificate...
Do you connect through a proxy server?
Do you use ESET security software? Its feature of scanning your SSL connections has been linked to this particular error code in the past. Do you want to try disabling SSL scanning in ESET and see whether that resolves it: http://kb.eset.com/esetkb/index?page=content&id=SOLN3126 If that works, there might be a problem of duplicate ESET certificates in Firefox's certificate store. It should be fixable.
Or it could be Avast 2015 as in this recent thread: Can NOT access https://www.google.com for google voice, mail etc.
I don't know how to connect to a proxy server. I do not have Eset. However, I do have (free) Avast and took the hammer to it and uninstalled it as I could not find the HTTPS scanning within Avast to turn it off. Everything is working fine. So that was the problem. Thank You for your timely response (I spent three days searching google with chrome and trying all kinds of things). Blessings to you!