Cool, and thanks for posting the update!

This means you’re targeting these classes/ID’s at your own peril, and they may break in a future update.

Me who’s just released a script using CSS selectors:

See my edit to the above comment, I misunderstood at first.

Yep I’m hoping we get more user-level control over the instances we see. This script is a naive client-side approach of just removing the HTML nodes of matching posts, but having it done on the server side would be ideal.

Nope it can block other instance’s communities. This script will block all posts at an instance level though, rather than having to keep adding blocked communities when people create more on that instance.