It's in the nature of things that such filters are never perfect (they don't consider context) – but for my purposes (removing trash from Reddit), it works great. Very satisfied, thank you!

Great add on, works exactly as described.

Impossible to use if you are not a web dev. No tutorials, no explanation on what a "selector" is.
Another annoyance is that the plugin closes when you take the focus out, meaning copy pasting is a pain in the *ss too.