Instead, he jumps to another argument entirely in the second half: Firefox's lack of an "app ecosystem". This is truly delusional. Firefox has just as much of an app ecosystem as IE: it runs code on websites you go to. It's true that it lacks Chrome's app store (which right now amounts to little more than a glorified link directory and alternate bookmark system), but if that's a disadvantage it applies equally to IE.
* Relatively slow only with sufficient handwaving: call IE's platform previews equivalent to Chrome's full releases, then dismiss without justification Mozilla's new accelerated schedule for Firefox.