fúdòngchuāngkǒu
ㄈㄨˊ ㄉㄨㄥˋ ㄔㄨㄤ ㄎㄡˇ
Simplified 浮动窗口
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 浮動窗口 and it comes back until you know it.