With a $10 billion advertising market at stake, Google, the fast-rising Internet star, is raising objections to the way that it says Microsoft, the incumbent powerhouse of computing, is wielding control over Internet searching in its new Web browser.

Google, which only recently began beefing up its lobbying efforts in Washington, says it expressed concerns about competition in the Web search business in recent talks with the Justice Department and the European Commission, both of which have brought previous antitrust actions against Microsoft.

The new browser includes a search box in the upper-right corner that is typically set up to send users to Microsoft's MSN search service. Google contends that this puts Microsoft in a position to unfairly grab Web traffic and advertising dollars from its competitors.

The move, Google claims, limits consumer choice and is reminiscent of the tactics that got Microsoft into antitrust trouble in the late 1990's.

"The market favors open choice for search, and companies should compete for users based on the quality of their search services," said Marissa Mayer, the vice president for search products at Google. "We don't think it's right for Microsoft to just set the default to MSN. We believe users should choose."

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