That is a bit puzzling, because the folder in which you originally had the link to https://webauth.comcast.net/auth/login? ... mcast.net/ also had other URLs!?
Yes.
LOL, you did more experimenting than I would have ever thought of! By "opening the folder" I meant clicking on it (or the + mark) to expend it and show the bookmarks (links).
While it's true that clicking on the folder I created named "Comcast", which contains the Comcast link, will immediately launch the warning box, it still pops up once or twice during a session even if the folder is minimized.
I have now talked to Comcast once by phone and twice by Live Chat and each time I explain the problem and point them to this thread for more details the first thing they say is something like: so you're having a problem with your browser setting is that right?
Trying to get them to even consider the problem might be with Comcast is out of the question! They give me answers to questions I have not asked and tell me I'm getting the popup because I've visited suspicious sites.
I give up, I'm not talking to them anymore

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