Is it, then, also immoral to fast-forward through TV ads on your DVR? Or perhaps to change the channel when an ad is on? Or go to the bathroom / fix yourself a snack in the other room / do anything else aside from watch the ad while it's playing?

If you also believe that's immoral, then I really think this thread is going nowhere, as it's unlikely we'll find common ground. If you don't believe TV ad-skipping is immoral, then what's the difference between that and web ad blocking?

Because it's automated? Why does that magically change its morality? Does that mean a self-built DVR that automatically skips ads is immoral? You and others are arguing "just because something is technically possible, it doesn't mean it's moral"... but you can't have it both ways. The technical ease (or lack thereof) by which you do or don't avoid seeing ads should have no bearing on its morality.