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Works fine for me. Can you provide more details? e.g. where are you trying to use it (profile comments, forums posts etc.), what extension are you using (Tampermonkey or Violentmonkey), have you tried disabling all other extensions and scripts, what exactly do you mean by "stopped working" (buttons appear but don't work or there are no buttons at all), etc.
It was disabled everywhere, I use Tampermonkey, I have no other extensions.
The feature was completely gone (no buttons at all) for me for a few days, but it's randomly back now.
I can't reproduce it. Do you have any idea what could be the cause? Is your internet connection stable (no lags, etc.), have you tried clearing your cache? Does it happen site-wide, or just on some specific pages?
Also are you sure the extension or script itself wasn't disabled? Do you see the Tampermonkey icon with the red number of working scripts in its corner when the issue appers?
Not working Edit: back working again
It seems it was fixed for a while but it's stopped working again.