All the browsers supported by selenium
FIREFOX
FIREFOX_2
FIREFOX_3
FIREFOX_PROXY
FIREFOX_CHROME
GOOGLECHROME
SAFARI
OPERA
IEXPLORE
IEXPLORE_PROXY
SAFARI_PROXY
CHROME
KONQUEROR
MOCK
IE_HTA
ANDROID
HTMLUNIT
IE
IPHONE
IPAD
PHANTOMJS