While Microsoft makes the dominant Internet Explorer 7 which will be bundled with Vista, Google has strong ties to the upstart Firefox browser, employing key developers and supporting Firefox with a search affiliate deal worth millions of dollars. Both browsers will have state of the art anti-phishing capability, protecting users from online scams that steal identities among other crimes.
Firefox has approximately 20% of the browser market share and appears to consistently gain ground against Internet Explorer. This may be because influential technically-minded people favor Firefox and promote its use.
By employing key developers and supplying technology support, since Mozilla Corporation is snug tight with Google, perhaps Google should simply purchase Mozilla with its war chest if and when a tipping point were to occur, and abandon any plans to ever produce their own browser client.