Word meaning shown in pop up window like safari

[magic_din]

I am from India and does not have good vocabulary. Every time I am reading some article and come across some difficult word, I have to use "search google for" option. Instead, I want a "Look up" option like safari to see the meaning of word in pop-up not separate window. Due to this issue, I have no option but to browse a lot in Safari than in Firefox.  Please fix it asap. 

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[rileylastname]

I absolutely agree, I LOVED this feature in Safari. I really hope it gets implemented in Firefox too! I wish I could give a thumbs-up twice.

[new_to_ff]

@Jonany extension that you recommend? I see a few but it looks like there are issues with them

[Jon]

Great question @new_to_ff! Let me look around and see.

Also tagging @jwaterman & @Juhis here too, in case they have a recommendation. They both work a little closer to Add-ons.

[Eeeee]

I have not used the English interface, you mean this↓? I also really like this feature. But it seems to work on other browsers too, so maybe it's not safari's own feature.