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You should always use the latest version of an add-on.
Version 0.0.4Released Feb 2, 2021 - 104.26 KBWorks with firefox 42.0 and laterAdded a feature that allows injecting Liker button into youtube video page. Author can paste their Liker button URL into video description. A temporary Liker button will be placed if the author has not define their Liker ID yet.
Source code released under GNU General Public License, version 3.0