What Is vFastExt?
vFastExt is a browser hijacker for macOS that may get installed on a Mac together with some free application or a file downloaded from a questionable source. A browser hijacker is a piece of software which can alter browsers’ default search engine, start page or new tab page and stop users from changing those settings back. A hijacker can also collect data about users (like their browsing history or search history) and show them ads based on the gathered data. You may follow this step-by-step guide to remove vFastExt from your Mac and get rid of Yahoo Search redirect.