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Mozilla's Firefox landed on a slippery slope last month and may face a slow demise as users desert the browser for Google's Chrome.
According to California-based analytics vendor Net Applications, Firefox lost a quarter of a percentage point of user share in May, ending the month at 9.9%. It was the first time Firefox has fallen below the 10% marker since November 2016.
Net Applications calculates user share by detecting the agent strings of the browsers people use to visit its clients' websites. It then tallies the visitor sessions - which are effectively visits to the site, with multiple sessions possible daily - rather than count only users, as it once did. Net Applications thus measures activity most of all, although differently than rival metrics sources that focus on page views.