Show HN: Extension to read messages without your friends knowing

If anyone is interested in the source for such an extension, I made a similar one and open-sourced it:

It's less than 20 lines total!

Author here: I could make this open source if anyone wants to collaborate (would need to tidy up code first, I made this in my noob years and its messy as hell)

Greasemonkey: http://userscripts-mirror.org/scripts/show/136261.html

Bad title, as if everone cares about some facebook specific thing.

Facebook is the only messaging system in widespread use with mandatory read receipts, as far as I know.

Which is damn useful, but also annoying.

Would love a Firefox version!

You could use the GreaseMonkey script that vnkatesh posted.

I think a custom tailored extension should offer a more consistent experience