Hey there
I have a question, do you want this extension to run on every website or some specific ones? What you want is to search every hyperlink on the page and edit them. By edit them, I mean add affiliate on the URL, correct? The affiliate code will be a user input field that can get by clicking on the extension icon. Right?
Also, when do you plan to start the project and when is the deadline, if there is one? Anyways, feel free to hit me up so we can talk more about this. I am very responsive. All the best