>>29388
You learned something new. That's the most important part of it.
And next time you find something annoying about a website, you'll have a much easier time fixing it with a userscript too.

>>29389
If new posts are loaded throug page auto refreshing, the script isn't applied, as it only runs once. That's what the MutationObserver handles.
Moreover, posts present on the page when you load the thread, and posts which gets added during auto-refresh, varies slightly.