I use it a lot and love it. Don't know if you know anything better, but this works great if you are a "Thefreedictionary" user

I just had to write a review to say that the ornery person who gave a 1-star review, "Firefox user 13236401," has absolutely no idea what they're talking about. Being taken seriously must be a major issue in their life. I mean, who writes like this?

"Social Media, eMail, Shopping, Medical, financial and SPAM"

That capitalization is all over the place. We haven't written it as "eMail" since 1995.

The reason for it needing access to all site data is clearly documented, and this applies to any web browser's extensions because that's how they work. When an add-on is open source, that means you can see what it's doing. You could spend 10 minutes and make it yourself. You can also see if it shares user data with any entity. So, while you go about your crusade against "SPAM," rather than blaming a small developer who's providing a free service, maybe just learn to look things up. I suggest starting with Google, Wikipedia, or The Free Dictionary.

I am doing the same thing as I did for my 2-star review on the official version; that is, copying active x's review:

"Works well, and this extension is even better than the official one because it doesn't act on double-clicking to open the dictionary right away; I often double-click to select text for reasons not related to a dictionary look up."

Folks, if you ever double-click a word or a phrase on a web page for something other than dictionary look-up, you want this extension rather that the official one put out by Farlex, Inc. for TFD. For, there is no option with theirs; double-click and be whisked immediately to their website. No hesitation, no exceptions.

On the other hand, this extension by polizz uses the right-click context menu. For the sake of a couple more clicks, you have the flexibility to do other things. Such as Search Google. Or, if you have it installed, using the "Wikipedia context search" add-on that appears on the context menu below this one. Nice.

Works well, and this extension is even better than the official one because it doesn't act on double-clicking to open the dictionary right away; I often double-click to select text for reasons not related to a dictionary look up.

Thanks for the update for FF57! Feels like I am a pet dog who is just allowed to meet his owner again after long absence :) I just dumped the surrogate with whom I failed to get along.

Thanks a lot for updating the plug in for Firefox 57 :)