CRX id
bhlgopklmjobaekmhljhjjkgahohndoa
bhlgopklmjobaekmhljhjjkgahohndoa
Description from extension meta
This extension blocks the requests that Facebook makes to update the read status of messages.
Description from store
This extension blocks the requests that Facebook makes to update the read status of messages.
I encourage you to read through the (very simple) source code to see how the extension works.