Great idea, but I'm 50% sure it doesn't work anymore if it ever did prior.

I've tried the extension and it's installed but it's not working. I want to ask how to use this extension on what version of mozilla, thanks devloper

Thanks a lot.
it works great on 20201015 to expand "view xx replies" but "show more replies" does not expend.
We need more of these small helps that put little effort on the creator but efficiently benefit a lots.