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I'm trying out switching over to Firefox and this is 100% the biggest thing I miss about Chrome. I keep double-clicking words and waiting a few seconds just for nothing to pop up.

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There are many extensions for Firefox that provide the same functionality. Here's one: https://addons.mozilla.org/en-US/firefox/addon/dictionary-ex...

Also, if you're using Windows, you can use WordWeb (which is a full-fledged app).

And on Mac you can three finger tap on any word to get a definition.

The firefox extension is incompatible with the current firefox version, and the UX of WordWeb is ... incomparably bad.

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