Four months after Yahoo closed a deal with Mozilla to make its search engine the default in Firefox in the U.S., Yahoo has managed to hold onto most of the share it grabbed from Google.

In the last two months, however, Yahoo’s U.S. search share has slipped slightly, losing three-tenths of a percentage point, according to measurement firm comScore.

After a January peak of 13%, Yahoo’s search share dropped in February to 12.8%, then shed share again, ending March with 12.7%, data recently released by comScore showed.

Mozilla changed the default search from Google to Yahoo when it released Firefox 34 on Dec. 1, 2014. The Mozilla-Yahoo deal was a result of the former not renewing its long-standing partnership with Google, which in 2013 generated approximately $275 million in revenue for Firefox’s developer.

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