brucedodsworth said

Post Office said firefox insecure site

The post office said Firefox is insecure? Or did the browser say the post office was insecure?

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate.

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message

https://support.mozilla.org/en-US/kb/connection-untrusted-error-message

http://kb.mozillazine.org/Error_loading_websites

i evntually completed Currency on line purchase but was doubtfull so called Post offcie and it was they that said Firefox insecure. The phenomnon was odd, the screen was jumping about each time data was enterred but completed. Previously i was trying to input data onto another website, Morning Star, using the same PC and was having difficulty ie wouldnt work. It worked on a second W7 laptop using Firefox. havent made any setting changes recently. thanks

I use kaspersky on both laptops.

Please take a snapshot of the warning.

In order to better assist you with your issue please provide us with a screenshot. If you need help to create a screenshot, please see How do I create a screenshot of my problem?

Once you've done this, attach the saved screenshot file to your forum post by clicking the Browse... button below the Post your reply box. This will help us to visualize the problem.

As a precaution,

You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

cant post screen shot as there has never been any certificates or warnings. I will check for malware thanks.

Firefox 51+ will mark HTTP connections with a padlock with a strike through and shows "Connection is Not Secure" if you click the Control Center 'i' button at the left end of the location/address bar.

Note that this message is meant as a warning that you could be vulnerable and that it shouldn't prevent (block) you from accessing the website.

You can press the ESC key to close a doorhanger with a warning message in the name and password field.

See also:

• https://support.mozilla.org/en-US/kb/how-do-i-tell-if-my-connection-is-secure
• https://support.mozilla.org/en-US/kb/insecure-password-warning-firefox
• https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean

More:

• https://blog.mozilla.org/tanvi/2016/01/28/no-more-passwords-over-http-please/
• https://blog.mozilla.org/security/2017/01/20/communicating-the-dangers-of-non-secure-http/