"eviscerate" was the first word I wanted to look up.

That was the message I got:
"The free version only supports English word lookups.

Wordwise defines any word in any language, and saves the sentence you're reading to Anki automatically."

PS: I installed the addon today via mozilla.org and I got this message so I guess I have the recent version.

When I install an addon and the very first interaction is a "Subscribe for money"-screen, that is not a good look.

Appreciate your quick reply, added a star.
I will try the addon and see if it does a good job for English vocabulary or if I run into "pay to use me", even for English. I will reevaluate in 2-3 weeks and may update my rating.

I use it daily. There is a persistent problem with the definition being incorrect or incomplete.

Check, for example, 'revert'. It gives only one definition: "to reply."

Instead, it should be something akin to this:

1. To throw back; to reflect; to reverberate.
2. To turn back, or turn to the contrary; to reverse.
3. To cause to return to a former condition.

works well but it only seems to work with english so i won't find it too useful for me

The best addon for anki

very good, but I'm not sure if I will be using this for creating decks as it does not allow to choose what definition to import, and getting all of them in one card is of no use; a card can be edited to one's need, sure, but there are addons that let you choose definition thus make the whole process more efficient;
thanks!