So far really good. When needing a quick definition, I would often have to open a tab for a specific website. I can get that from Definer.
One main issue is that you can use either the dictionary OR the translator, not both at the same time.
As a non-English speaker, I'd rather search for the English definition AND get the translation in my mother tongue if needed.
Please, add a tab to access the translation from a definition, and conversely.

Maybe also add links to the thesaurus?

I do like the custom source feature with dynamic fields! I was able to easily add the Meriam Webster dictionary or Thesaurus. If we could create several custom sources (with different custom icons), that would be great. I could expand on the capabilities of a great tool!

I love this extension, it's extremely useful. Eventually adding multiple custom dictionary sources would be really cool.

Edit: Not really sure, but it breaks inkblot.art and most review pages on online shops. I have to disable it from the addon manager to get them to work

There needs to be an option to change the size of the popup when you click the extension icon. It is currently way too big and blocks out a lot of the screen. A size closer to the Google Dictionary extension on Chrome would be much better. There should also be an option to disable automatic searching when you're typing. I can press the enter key myself. Adding synonyms would also be useful.

need infinite custom not only one

Good.
great features, great design but interferes with the functionality of the EdgeTranslate extension
https://github.com/EdgeTranslate/EdgeTranslate

Love it! Wish it would display synonyms too :(