I was once in the forum of PSN on various pages in the community and support area and have looked at there the various problems of each user. On almost all of these sites, my Firefox browser had indicated that the connection was secure, but when I viewed a page I was then shown an insecure connection.
At the mentioned site a user described that his account was hacked and somebody changed his e-mail address where he could not connect his PS4 to the PSN anymore and that he himself would not have the chance to correct the wrong address. PS: I do not have an account for PSN.
After reading everything on this one page, I wanted to go back to the previous page by clicking on the arrow icon on the top left corner of the screen. The previous page did not seem to load properly and it was completely white. I clicked on the same arrow again and another page in front of it was loaded normally again.
I then looked at other sites outside of PSN on the Internet and noticed that the loading times have generally become longer. My anti-virus program could not find anything and the duration of the load times had not changed.
Does my PC still have a virus or Trojan, or has just accumulated too much garbage that slowed everything down?
Could not it just be possible that your internet connection was bad for a short time and the explanation for that was?
Just because Firefox rummexkert that the site does not support https, it is still far from saying that something is wrong.
A virus or something else I think is absolutely unlikely.
Delete the browser cache and other data and see if it is back to normal.