Tag Copier v1.4.1
Allow copying all tags or only copyright tags from some specific sites (taggable imageboards) such as Anime-Pictures, pixiv, Danbooru, Konachan, SankakuComplex, and so on. You can set up different tag styles and hotkeys.
Warning, the extension just copies the tags, so keep in mind that different sites can have a (partially or entirely) different definitions or spellings of the same tag.