The confirmation of a third Democrat to the Federal Trade Commission on Wednesday broke a partisan deadlock at the agency. That’s good news for Lina Khan, the agency’s chair and a Democrat.

It is also a test.

With the F.T.C.’s new Democratic majority — which came with the confirmation of Alvaro Bedoya, who becomes the fifth commissioner, in a slot that had been vacant since October — Ms. Khan’s allies and critics are watching to see if she pushes forward plans to address corporate power. That could include filing an antitrust lawsuit against Amazon, setting online privacy rules and tapping little-used agency powers to clip the wings of companies like Meta, Apple and Google.

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Sarah Miller, the executive director of the American Economic Liberties Project, a progressive group that wants more antitrust enforcement, described the F.T.C.’s two Republicans, Noah Phillips and Christine Wilson, as “libertarian holdouts” who have “kind of thrown the brakes” on Ms. Khan’s ability to advance her agenda.