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Hi friends!

I know how to block the SEEN on facebook messages on facebook desktop browser:
The problem is it does not work for facebook mobile version - m.facebook.com.

Any one know how to block seen on facebook mobile version?

FTR the actual filter for desktop Facebook is ||facebook.com/ajax/mercury/change_read_status.php$xmlhttprequest and maybe I'll figure out what URL is used to detect that a certain post was seen on mobile; my guess is that it doesn't use XMLHTTPRequest because the low-end devices that Facebook Mobile is designed for might not support that.