Earlier quoted context omitted.
Exactly. It's like saying if only Firefox had gotten rid of extensions so the UX was unified they could have taken over IE.
There is only one extension that ever really mattered: Firebug. A lot of developers wound up using Firefox to develop web apps even when the web app was intended to be used in IE. That's important because it broke the vicious cycle where nobody used Firefox because nobody developed for Firefox and nobody developed for Firefox because nobody used it. You might use other extensions, as do I, but this is such a deal-bre…
The relevance of extensions has somewhat faded, aside from ad blocking, byt back the day extensions were imo quite important for many, made the web a popular & more lively place. I'd have a number of extensuons telling me other related sites people were enjoying. I could annotate the page, chat about the page. I could easily save the page into my various bookmark services. Extensions made the web social, & helped it interconnect. Extensions interwove the web & drove cool at a critical time of adoption.
Whatever the state today, to ignore the historical relevance of how important extensions were for generating an active, enthusiastic user base, for differentiating: these are not to be ignored or casually cynically written off.