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Using Firefox now, making a selection and then force-clicking it opens it in Look Up

You are right. That must be pretty new. Thank you for letting me know - this is really useful for me!

This was available in my late 2017 macbook pro with force touch. I know because I don't like this feature and was searching for a way to disable it.

Didn’t work on Japanese text for me just a few months ago. 2018 MacBook Pro.