Doesnt work in firefox 130.0.1. Its been a while since it was last updated. So probably abandonware!

works pretty well, would like it if there was multi-lingual support too.
maybe you can do it so that it sets your default language, and when you select a word from a foreign language it translates it to yours and shows definition [can maybe use Wikipedia for that]

doesnt effing work, beyond useless

It disabled the context menu, like, seriously? Oh well, I was just checking this out, I already have a good Definer add-on.

It's great.

Sorry

No definition found.

It works great on some websites but inexplicably doesn't work on others, even though the extension says it "Can always read and change data on this website"

Doesn't give uption to check spelling

Es muy buena extesión, me gustaría que también tuviera un modo oscuro.