Cookie prompts from my own IP ???

[#1]

Not sure if this is the right place, but as it's to do with my internet connection:
I'm currently trying out another browser (Pale Moon). All set up yesterday and all running fine. Today when I open the browser I get a series of about twenty cookie prompts from an IP address. When I check that address I find it's the one I'm currently assigned. Does anybody have any idea why I would get such prompts from my own IP address?

[#2]

What page is the browser trying to open?  Has Pale Moon set a local file as your homepage?
Scrub that - It wouldn't explain why the cookies are from your WAN address

[#3]

Probably doesn't help but I use Pale Moon as my usual browser both on Plusnet at home and BT Business at work, I have never experienced cookie prompts from my own address.
What homepage is set in the browser?

[#4]

I have, like Firefox, set about:blank as the homepage, and when both start they are both set to use a blank page.

[#5]

I have managed to stop the cookie prompts by changing my settings in Pale Moon, which it transpires were slightly different to the settings I have in Firefox. For anyone else experiencing the same and who may come to read this, change the following settings:
Tools/Options/Privacy - In the History section, select Pale Moon (or Firefox) will: Use custom settings for history which expands further settings - Tick Accept cookies from sites - Accept third-party cookies: Never.
It was set to the default 'Always', hence the prompt. It doesn't, however, explain why I should be getting cookies from my own IP address precisely.

[#6]

Did you ever see what info was being set in said cookies? It may hold the clue to where it's coming from.

[#7]

Only ever saw random characters on them.

[#8]

What if anything do you get if you open your WAN IP address in a web browser?
You could also check for open ports on http://canyouseeme.org/ and use TCPView to see what's running on your computer.

[#9]

I get my router login page when I open my IP address in my browser. I already know from previous checking that my ports are stealthed. The typical view via TCPView of what's running is in the attached image.