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I'm having the same issue on Firefox 99 on Linux (NixOS).

Agh. Turns out Firefox doesn't support it, my bad! Safari and Chrome work fine, but I'm guessing that's not an option for many Linux users. Sorry!

Firefox 101.0a1 (2022-04-22) (64-bit) says:

> Uncaught (in promise) ReferenceError: ClipboardItem is not defined