How to Fix Three Finger Tap for Firefox


I used to be able to highlight a word and then tap with three fingers on the trackpad and a dictionary definition would pop up. Sometime in the last month I haven't been able to do that. Firefox has upgraded maybe once or twice and I upgraded to Mac OSX El Captain.

And yes, I did enable it in Preferences:
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And it does work in other programs since I enabled it.

Best Answer

You can't right now. Unfortunately, this appears to be a bug: