Facebook Read Message Block is a website blocker extension for chrome. also, it is facebook extension. it's a free extension , it has 8 active users since released its first version, it earns an average rating of 5.00 from 1 rated user, last update is 2975 days ago.
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.
You could download the latest version crx file or older version files and install it.
English.
You could find more help information from facebook read message block support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of facebook read message block.
You could click to report abuse of facebook read message block.