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As of December 2019, Video DownloadHelper is the third most popular extension for Firefox [4] (after Adblock Plus and uBlock Origin) and the second most popular Mozilla-recommended extension [5] with 2,848,968 users.
A Browser Helper Object (BHO) is a DLL module designed as a plugin for the Microsoft Internet Explorer web browser to provide added functionality. BHOs were introduced in October 1997 with the release of version 4 of Internet Explorer.