Sample of error

Come on guys. I've used Mozilla for years and don't want to stop but this makes browsing literally impossible.

Technical Details:

www.google.com uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)

Check out why the site is untrusted (click "Technical Details to expand that section) and if this is caused by a missing intermediate certificate then see if you can install this intermediate certificate from another source.

You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.

• Click the link at the bottom of the error page: "I Understand the Risks"

Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".

• Click the "View..." button and inspect the certificate and check who is the issuer of the certificate.

You can see more Details like intermediate certificates that are used in the Details pane.

If "I Understand the Risks" is missing then this page may be opened in an (i)frame and in that case try the right-click context menu and use "This Frame: Open Frame in New Tab".

Note that some firewalls monitor secure (https) connections and send their own certificate instead of the website's certificate.

• ESET Setup -> Advanced setup -> Web and email -> Protocol filtering -> SSL
• Certificates: Add the root certificate to known browsers

See also:

• SSL protocol: Do not scan SSL protocol

Check the connection settings.

• Tools > Options > Advanced > Network : Connection > Settings
• https://support.mozilla.org/kb/Options+window+-+Advanced+panel

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":

• https://support.mozilla.org/kb/Firefox+cannot+load+websites+but+other+programs+can

Site is untrusted because "it hasn't been verified by a recognized authority using a secure signature.

When I click "Get certificate" it reloads and comes up with the same error.

Also, I have it set to no proxy being used.

How could it be a firewall issue if only firefox isn't working.

Certificate details shown in image

Thank you for the screen shot, which shows that "Sendori, Inc." issued Google's certificate (which obviously is not true).

Sendori is a program/service that changes how your computer checks web addresses.

Do you recall installing Sendori? If not, you can remove it using the Windows Control Panel, at least according to the publisher:

http://support.sendori.com/entries/24095683-How-do-I-remove-turn-off-or-uninstall-Sendori-

go to your windows control panel and uninstall the sendori program & also run a full scan of your system with different security tools like the free version of malwarebytes and adwcleaner.

Thanks. No I never willingly installed it. This probably explains the annoying text ads I've been getting too. Thanks a bunch to all you guys!

Alright I'm back. Just letting you guys know the problem is resolved and I'd like to thank you guys for your help.

"all websites say untrusted connection"... "site loads in plain text (bare bones of website)"

My Answer: Re-synch your operating system time/date with an internet time/date server.

Explanation:

This happened to me recently after I had just reassembled my computer after I had to troubleshoot which piece of hardware was causing the computer to not turn on. (it was a bad power supply which I replaced with one from one of my old towers I was no longer using... which is why you should never throw away your old systems when you get a new one).

At one point I had removed the CMOS battery from the motherboard to test it. When I reassembled the computer and got it booted up again I noticed that every site I went to in firefox was throwing up the untrusted alert and showing with no page formatting or multimedia. I did a quick search and found this support thread but reading over all the answers I could see that while my problem had the exact same symptoms the cause on my system was completely different.

I found that my system clock and calendar was way off. Windows thought the date was January 1st, 2008 (when it should be April 6th, 2014. And the time was wrong.

How I fixed it:

So I right clicked on the time in the lower right corner of the task bar and chose "adjust date/time" and clicked the third tab titled "internet time" clicked "change settings" check the checkbox for "synchronize with an internet time server" and clicked update now. This set the time and date properly and now when I opened or refreshed firefox everything was back to normal. This worked because now the system was able to recognize the time/date stamps on the site certificates as being valid now.

Hope this alternative solution helps people.