I get a certificate error using firefox, I have tried deleting cert8.db, and resetting Firefox. I don't have any errors using IE 10. What can I do?

I used a link in an email to check the status of a repair from Acer and received the error "customercare.acer.com uses an invalid security certificate.
The certificate is not trusted because no issuer chain was provided.
(Error code: sec_error_unknown_issuer)". I tried going directly to the Acer website, and went to support, then to check case status. I received the same error. I reactivated IE 10 on my OS and had no problems with certificate errors. I use McAfee Antivirus suite from ATT Uverse, but the troubleshooting did not indicate any settings for that, only ESET and Bitdefender.

Could you take a look at the certificate details?
If you click "I understand the risks" and "Add Exception", then the "View" button, does it look at all like the attached? I suggest using a new window to compare because when the certificate viewer is open, you cannot switch tabs in the same window.
You can cancel the viewer after checking, you may not want to create an exception until getting further comments.

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Can only open firefox as admin, otherwise get error to say a security component could not be initilaised. Have tried deleted cert8 file but it is not recreated and still will not open

Had problems with os and now can not open firefox unless I run as admin. Error appears - Could not initialise the application's security component. The most probable cause is problems with files in your browser's profile directory. Please check that this directory has no read/write restrictions and your hard drive is not full or close to full. It is recommended that you exit the browser and fix the problem. If you continue to use this browser session, you might see incorrect browser behaviour when accessing security features.
I have tried deleting the cert8 db file but it is not recreated when I start firefox again. HD has lots of room. Can you suggest anything else to try please?
thanks, mandi

If deleting or otherwise removing the cert8.db and secmod.db file doesn't help then try a new profile.
*https://support.mozilla.org/kb/Could+not+initialize+the+browser+security+component
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See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
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*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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Thanks for the solutions regarding Firefox not opening, but I've tried all of them before posting to the forum and none worked. In addition to those steps I've also uninstalled and reinstalled Firefox three times. But that didn't help. Oh, I've also done a rollback to a date that preceeded the problem but again, no good. I' stumped at this point..........

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Also free (well donations are accepted by the developer)
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I get a certificate error using firefox, I have tried deleting cert8.db, and resetting Firefox. I don't have any errors using IE 10. What can I do?

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