So, who is the issuer of the certificate?

You can't attach a screenshot to the first post that starts a thread, but you can do that in subsequent replies.

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

• Use a compressed image type like PNG or JPG to save the screenshot
• Make sure that you do not exceed the maximum size of 1 MB

The only thing I get about the issuer is this link: http://www.telerik.com/fiddler (Thanks for the screenshot links. I was never sure how to really do it!)

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

Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and

• Remove Cookies Warning ! ! This will log you out of sites you're logged in to.

Type about:preferences in the address bar and press enter.

• Cookies; Select Privacy. Under History, select Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.
• Cache; Select Advanced > Network. Across from Cached Web Content, Press Clear Now.

If there is still a problem, Start Firefox in Safe Mode {web link} While you are in safe mode;

Type about:preferences in the address bar and press enter

Select Advanced > General. Look for and turn off Use Hardware Acceleration.

Poke around safe web sites. Are there any problems?

Then restart.

This helped me with most of the websites that I use, but not all of them. Any other tricks that could help out with the situation?

Can you give a short list of what sites, and there problems?

FiddlerRoot usually indicates unwanted software being installed named similarly to BrowserSafeguard, BrowserSafe, SafeGuard

See /questions/982532#answer-520145