> If Comcast announced they were doing this, HN would be up in arms about how they were modifying traffic. I'm aware of the browser vs service provider difference, but the end result is the same.

I wouldn't as easily dismiss the difference between the browser vs a service provider, but regardless, I assume Mozilla will make it an option you can turn on or off at will. I doubt Comcast would do the same.

If Mozilla comes out with something that changes content without user's choice, I'm willing to bet HN will justifiably be up in arms.