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This is due to lack of support for Greasemonkey 4.0 scripts.
Violentmonkey 2.10 doesn't have support for GM.* API according to the docs https://violentmonkey.github.io/api/, and I don't think the author has plans to add support. This forces script developers to add polyfills (or patches) to every script that uses the GM.* API, or avoid the API altogether.
I see. I had another script running which didn't work with Greasemonkey, but now I installed Greasemonkey and this script is working fine. Thank you!
"GM is not defined"
The script does unfortunately not work. Console output from Firefox:
If I click on the icon I get this: