This script can force sites to use Microsoft Yahei.
I've already write rules for many websites, so generally you won't see any square on the pages.
If you see a square on some page , please send a feedback to me and a link, a screenshot. I'll fix it ASAP.

Because more rules will make site loading slower, so if you meet bug on lots of pages, you could use this compatible version:
https://greasyfork.org/zh-CN/scripts/371452

[Tips: Microsoft Edge CANNOT run this script correctly, please use Chrome or Firefox!]

[Thanks for your usage and feedback]