Hi, here's a couple of possibilities -

• Thesaurus: Synonyms and Antonyms

• Dictionary Pop-Up by Dictionary.com (Official)

If your question is resolved by this or another answer, please take a minute to let us know. Thank you.

Thanks Scribe! Tried the first one already. It installs but I guess is no longer supported. I had the second one already and that does work on normal web pages with just double clicking on a word. I was hoping for an actual right click menu choice. The reason being, when I'm working on a post in Wordpress the double click dictionary thing doesn't work for some reason, I assume because I'm in an editor. So I thought with a right click choice I could still quickly get synonyms for certain words as I'm writing my articles.