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Greasemonkey are unsupported
Greasemonkey dead
Greasemonkey 4.0 is a new addon, just same name
it has many bugs, poor compatibility, and maintenance stopped
Doesn't work. Firefox portable 116 + Greasemonkey.
Extra "button" don't appear.
I tested on fresh (clean) Firefox distribution.
Do you want extra information?
With Tampermonkey works fine.