Is Yahoo Growing?

Yahoo’s share gains since November from a partnership with Mozilla may be a clue about whether the search company can gain new users through the just-announced contract to change Internet Explorer’s and Chrome’s default search through installations of Oracle’s Java.

Although the news of the Yahoo-Oracle partnership got the lion’s share of attention, CEO Marissa Mayer also used last week’s shareholder meeting to mention the Mozilla pact.

The five-year contract with Mozilla, the maker of Firefox, has boosted Yahoo’s share of the U.S. search market, but growth has stalled for the last three months, according to measurement company comScore.

On Wednesday, Mayer asserted that the Mozilla deal — negotiated last fall — was “profitable,” but didn’t provide any numbers to back that up. Neither Yahoo nor Mozilla has disclosed how much the former paid to become Firefox’s default search engine in the U.S.

By comScore’s measurement, Yahoo accounted for 12.7% of all U.S. searches in May, the same share it controlled in both March and April. Although that was 2.5 percentage points higher than in November 2014 — before Firefox began urging users to accept Yahoo as the default — and represented a six-month increase of 25%, May’s share was down from the January peak of 13%.

From all indications, Yahoo has gotten as much out of the Firefox deal as it will likely get. The flip-side is that Yahoo has hung onto most of what it grabbed from Google — Firefox’s previous default — even as Google has tried to get users to return.

For May, comScore pegged Google’s share at 64.1%, down one-tenth of a percentage point from the month prior. Microsoft’s share rose that one-tenth of a point to end May at 20.3%. Because Bing powers Yahoo’s search results, Microsoft’s technology accounted for 31.4% of all U.S. searches, still less than half Google’s 65.2%.

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