Greasy Fork is available in English.
Watch page description below the video with proper open/close toggle, instead of a side bar.
< 脚本 YouTube - Proper Description 的反馈
What script manager are you using?
Violentmonkey
The script should work with Tampermonkey. Other managers are not tested and not supported, but should also work with Greasemonkey.
Doesn't work for me unless I change document-start to document-end, also document.head to document.body
I'm using firefox with the non rounded design script