Bluesky Slow Blocker by Brokenpla.net

Bulk-block/mute accounts from Bluesky feeds, profile followers, or thread replies — with a review queue and a pace you control.
Bluesky's built-in blocking is one account at a time, which doesn't scale when you're dealing with coordinated spam networks, bot swarms, or a wave of harassment in a single thread. This extension collects candidates from four sources:
Feeds — import every account posting in a given feed (useful for algorithmic feeds that surface a particular kind of unwanted content)
Followers — block everyone following a specific profile (e.g. a spam or bot account's follower base)
Threads — block everyone who replied to a specific post (useful after a pile-on or brigading incident)
Imported files — Import and export (backup-)lists as you see fit

Nothing gets blocked automatically until you want it. Every collected account lands in a review queue first, so you can remove false positives before anything happens.
An exclude list (with one-click sync from your own follows) keeps people you follow out of the queue entirely.
Bubble functions protects follows'-follows and/or followers'-followers.
All that at a configurable pace (1–25 blocks/minute) spreads the actual blocking out instead of firing it all at once.
Underlying command stack: push all buttons like crazy, commands get queued.
Regrets? Unblock/unmute is just as easy. -and slow.
Tested with huge lists. Stays very nice on computer resources.
Languages: EN, FR, DE, NL, JP and KR.
No 3rth party services, it's just between Bluesky and you.

Drawbacks:
-Due to the fact that this is also using the Bluesky API, you need to set a special "app" password in the Bluesky settings.

Perhaps a note of caution; with so many lists, it's easy to get confused. It (hopefully) hasn't been tested, but you probably can import a protected list into a block queue. I suggest you don't do that. Feedback is welcome.

Also, this is my first vibecode and first extension, congrats to me.

Open source. Not affiliated with Bluesky Social PBC — an independent tool built on the public AT Protocol API.