Their browser share has dropped from a peak around 90% to more like 67% I think.
Those browsers gaining market share are based on Google's engine, though.
That still gives Google de facto control of the web, or at the very least control of web standards.
Those companies building atop Chromium can maintain their own forks of the core rendering engine, but that is a very heavy burden indeed, and Google can always decide to move off of Chromium onto their own private fork and leave everybody else on their own.
