Works perfectly, but had to read through documentation to find how to block seen on all chats. It should be "Whitelist" mode by default. Because I think most people want to block seen on all chats.

Can't send any messages at all when this extension is active, I'm using whitelist mode, the block seen feature still works tho, please fix.

the only "block seen" extension that works perfectly in the Mozilla browser in 2024.
keep up the good work !