Carrotist
Carrotist
Interesting，I closed fast seek and it works! The same video in bilibili synced up. Though this operate would indeedly slow down the control, but it works. 
Maybe you can ask other Firefox users to try it out, after all, this might be my individual problem.
#434 我在很久以前遇到了这个问题，你可以参考，建议先将输入法更换为微信输入法或者微软拼音输入法 #434 I encountered this problem a long time ago, you can refer to it. It is recommended that you first change your input method to Weixin Input Method...
刚从Edge转成zen，只有简阅不能迁移，现在很难受，我是高级账户重度使用者，希望作者考虑一下适配，zen还是比edge好用不少