A lot of people are under the misconception that Firefox and Chrome are rivals, but the opposite is the case. They both have the motto of "furthering the web", however you want to interpret it.
As for Reader, Adobe probably don't really care if others come along. Acrobat is the main product, and the fact that other PDF readers exist just gives people more reason to buy it. PDF is also an incredibly large specification, full of crazy features, and I think Reader might be the only one that implements all of this functionality.
As for Reader, Adobe probably don't really care if others come along. Acrobat is the main product, and the fact that other PDF readers exist just gives people more reason to buy it. PDF is also an incredibly large specification, full of crazy features, and I think Reader might be the only one that implements all of this functionality.