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How can i enable the right-click to select 'look up' for firefox in MacOS Mojave?

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In other browsers i used to be able to do a 'look up' on any word by right-clicking on my selected word, i was able to do that in Safari, Chrome and Opera browsers, but after switching to Firefox, i'm not able to do that anymore. Is there a way i could enable that feature/function? it is one of the most useful feature/functions around. please help. thanks.

In other browsers i used to be able to do a 'look up' on any word by right-clicking on my selected word, i was able to do that in Safari, Chrome and Opera browsers, but after switching to Firefox, i'm not able to do that anymore. Is there a way i could enable that feature/function? it is one of the most useful feature/functions around. please help. thanks.

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