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> userChrome.css does not work for the context menu on macOS

Putting:

#context-sendimage { display:none!important; }

in that file works for me.

Does not work on macOS, it uses native context menus that can't be styled via userChrome.css.

Try disabling widget.macos.native-context-menus

That's what was missing, thank you!

> Does not work on macOS

Yes it does.

See the other comment, you have to disable "widget.macos.native-context-menus".

So was I wrong?