Potential Security Risk warnig won't go away
A month ago I suddenly found that I was no longer able to open my ISP's webmail page. I got the security warning shown here. I had many conversations with my ISP's tech, who couldn't figure out what was going on. At the same time I was finding that one or two other websites were not working properly. I finally tracked down the cause to the DuckDuckGo Privacy Essentials extension. When this was disabled, all the problems went away. Everything seemed fine until yesterday, when we had a brief power outage that caused my PC to restart while FF was in use. After this, when I started Firefox, I found that once again I was getting the security warning when I tried to open the webmail page (though none of problems I previously experienced with the other websites). The DDG extension is still disabled. I have of course tried deleting the cache with no effect, and this time I have even gone so far as to refresh FF, and finally uninstalled it and reinstalled it - TWICE. Nothing helps! I now suspect that this is being caused by something that remains in the registry, even after uninstalling and reinstalling. However, as I am not experienced with making changes to the registry and wouldn't know how to start, I need help with this. Could somebody please advise me as to what I should do?
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You can check the date and time and timezone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.
Obviously, in view of the wording of the warning, that was the first thing I checked.
I checked the certificate and it has expired over a month ago, so the website needs to renew the certificate.
Valid until Sun, 19 Feb 2023 23:59:59 UTC (expired 1 month and 15 days ago) EXPIRED
That's interesting. As I mentioned, I talked to several Cogeco techs and needless to say I pointed out the date on the warning, but they all confirmed that Cogeco's certificate had not expired. Also, among the many things we tried, I installed Chrome and this had no problem opening the site. I could also open it using Safari on my iPhone. Then, as I mentioned, I had the idea of disabling my extensions one by one and found that when DuckDuckGo Privacy essentials was disabled, the problem disappeared. After that I used the site for a couple of weeks until the day before yesterday, when a power outage caused my computer to restart while FF was running. After that the warning message started to appear again and nothing I can do will resolve the problem, not even uninstalling and reinstalling FF, which leads me to believe that the uninstall is not removing all traces from the registry.