good because lexico.com (backend) has both english and spanish so very useful.

I like the thoroughness of this add on. I use the hardbound Oxford English Dictionary all the time, but this is a quick solution for looking up words.

Since 'oxforddictionaries.com' modified its site, I have had to jump through a few hoops to get at the definitions. Annoying.

I don't know how to adjust Firefox's search engine settings for that.

Thanks for this add-on.