[Zoomla]

Chrome also thrives because so many people use Google's search engine and they keep telling you to install Chrome...

[OvidNaso]

I do wonder, in the early days of Chrome, how many people downloaded Firefox, did their first search with the default search engine, then downloaded Chrome.

[Zoomla]

This is an interesting question that Google can probably answer, but I would guess that most people don't download it on the first ad impression.