[2] http://www.businessweek.com/technology/content/jul2009/tc200...
[3] https://www.yahoo.com/tech/firefox-update-sees-yahoo-replace...
[4] http://searchenginewatch.com/sew/study/2345837/google-search...
[5] http://gs.statcounter.com/#desktop-browser-ww-monthly-200807...