jscher2000 said

Generally speaking, you should not need to create security exceptions in Firefox, especially on mainstream sites. The fact that you are familiar with how to do it suggests that you have a pattern of secure connection problems. When you get this for pretty much all secure sites, the problem usually is one of the following: (1) Error in your system's date, time, or time zone, which throws off certificate validity checks. Sometimes allowing computers to use an internet-based time source can introduce this problem. (2) Firefox not being set up to work with your security software that intercepts and filters secure connections. Products with this feature include Avast, BitDefender, ESET, and Kaspersky; AVG has a Search Shield feature which can cause this error on search sites. (3) On Windows 10, Firefox not being set up to work with the parental control software Microsoft Family Safety. (4) Malware on your system intercepting secure connections. So... which is it? If you have any of those specific security products, that would be the first thing to check. We might be able to assist with specific next steps based on what you have if you tell us.

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To investigate further, try viewing certificates you saved as exceptions to see whether they reveal the culprit. You can open the Certificate Manager here:

"3-bar" menu button (or Tools menu) > Options > Advanced

On the Advanced Options panel, there is a row of mini-tabs along the top. Click the Certificates mini-tab, and then the View Certificates button.

That should open the Certificate Manager. Click the "Servers" tab to find site-specific exceptions. Ignore the ones where the server is designated as "*", those were not ones you added. Select one for a site you recognize and click the View button. Then inspect the "Issued by" and "Certificate Hierarchy" for clues.

I just got done trying that, still didn't get anywhere. :/

Okay, just to summarize the current status:

• You removed whatever was causing sites to show the FiddlerRoot certificate, so that issue is resolved

• You still cannot connect to Yahoo, Bing, or Google, or ??
  • You said they were messed up in some way. What does that mean?

• The same problem occurs in a fresh profile with default settings

Is that right or do you want to clarify anything?

Thanks for everyone's effort in trying to help me, I was never able to fix the problem but since reinstalling the issue is gone. thanks again.