Can you provide a screenshot with the error? http://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem

This Connection is Untrusted is sometimes caused because the computer system clock is wrong. Check the time / date / time zone settings.

Check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.

Check out why the site is untrusted and click "Technical Details" to expand this section. If the certificate is not trusted because no issuer chain was provided (sec_error_unknown_issuer) 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) connections and that programs like Sendori or FiddlerRoot can intercept connections and send their own certificate instead of the website's certificate.
• Note that it is not recommended to add a permanent exception in cases like this, so only use it to inspect the certificate.

Posted an image of one. Note that this is for BofA site. I can go to this same page 5 times and only one or two of them I get this message. Why are those times different than the 3 or 4 I had no problem. Also not that this one actually has the Add Exception choice, not all have that, and the reasons vary. I really don't want to work that hard to use my browser. I like Firefox and have been using it for years. This is only a problem that has come up in the last 3-4 weeks and I'm about to go to Chrome or IE so I don't have to deal with it any longer.

I really don't want to work that hard to use my browser.

The problem isn't your browser. This behavior can be an indication of malware. You can choose to ignore it, but it won't do you any good.

I'm about to go to Chrome or IE so I don't have to deal with it any longer.

If either Chrome or IE do not do alert you about a questionable cert, that's reason enough not to use those browsers.

Attempt to add an exception by clicking 'Add Exception' at the bottom of the error page & inspect the certificate (see the screenshot attached for instructions):

Do not actually confirm the security exception.

Who is the issuer of the certificate?

I have the same untrusted connection error. No issues with chrome or IE....... Not all sites give me the "trust this site" or "add exception" option. I've checked the clock issue, and it's not that, I've tried re-naming and deleting the cert8 file, that hasn't done anything, COME ON FIREFOX GET IT SORTED !

You need to check the issuer of the certificate.

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.

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

• Note that some firewalls monitor (secure) connections and that programs like Sendori or FiddlerRoot can intercept connections and send their own certificate instead of the website's certificate.
• Note that it is not recommended to add a permanent exception in cases like this, so only use it to inspect the certificate.

I don't think people are getting it. I tried a lot of these things in the beginning. I get the message randomly. When I'm paying bills on line. I'm in the BofA site. I'm looking at my account detail. I pay a bill, then go back to try to look at my account detail again and I get the message. I've run software looking for Malware, nothing. It's random and happens looking at trusted pages I've already been to and am just trying to get back to. I'm trying to buy something on line and have a time sensitive transaction and I get the message totally F'ing it up. It just go to be too much, so I gave up. I still have it. I even deleted it completely and re-loaded it. Hoping it'll clear up some day but I'm using my IE until it does.

I have this problem too and none of the FF Help solutions are effective. The time/date thing won't work because I use a VPN that gives me an IP in another time zone sometimes. I need to be able to surf the web with local time on my computer while using a VPN that is connecting thru another time zone.

Also, when I add an exception for these certificates, "a page" will load, some page, but not at the website I'm trying to access. For example, if I'm trying to access Youtube and add an exception for it, I end up at a completely different website, some weird site that doesn't seem to do anything. AND IT WILL BE THE SAME FOR EVERY EXCEPTION I ADD.

When I connect to the Net with an IP addy that matches my time actual time zone, I don't have any problems, but this isn't feasible for watching certain videos that require a USA IP or for default language options like at Google that automatically display your "local language."

The time zone thing needs to be fixed. Maybe you can update FF so it ignores that when using a VPN connection.