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Revision strings can be obtained from ",(0,a.kt)("a",{parentName:"p",href:"http://omahaproxy.appspot.com/"},"omahaproxy.appspot.com"),". In the Firefox case, BrowserFetcher downloads Firefox Nightly and operates on version numbers such as ",(0,a.kt)("inlineCode",{parentName:"p"},'"75"'),"."),(0,a.kt)("p",null,"The constructor for this class is marked as internal. 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