It had little things like multi-process, omnibox, and something like a 10x faster JS engine than the competition, but the real killer feature was the auto-updating.
It did come with advantages, no doubt, but - as so often - its market share is not necessarily because it tried to push the web further, a large share is simply because of Google's aggressive marketing.
To this day Google is pushing their browser if you dare to use their services with Edge.
