Adds a "Copy lyrics" button to lyric pages to enable one-click copying of lyrics and song information. ボタンを足すことで歌ネットの歌詞と楽曲情報をワンクリックでコピー。 Uta-Net is a website that has lyrics for tons of Japanese music, but it disallows text highlighting, making it difficult to copy text from the page. This is a solution to that problem.