My previous userstyle Clearer Chinese Sites - w/ MS JhengHei/YaHei Fonts (Clearer Chinese Sites - w/ MS JhengHei/YaHei Fonts) has a list of sites which it supports to override font setting.
There are requests expressed by heavy Chinese site surfers who want to use MS JhengHei / YaHei font for ALL sites.

So, this userstyle is created to support that.

This style uses url-prefix trick to wildcard all urls starting with http or https to use MS Yahei (雅黑体) font.

See also: Use Microsoft JhengHei (正黑體) Font for all site (Use Microsoft Yahei Font for all site)