Hi, I know how to make this happen, I have donde the different pieces needed in past project
I have the Windows System Hook, that can listen Windows Events and see when a browser has been open and read the URL
I also have done Toast Notification
I have developed lots of web api, from where you can specify what are the URLs etc, and the client program will read and refresh it list
I'll be glad even to do a proof of concept without you awarding me, just to show you that we can do this.
Thanks,
Felice