The
Firefox search bar is a wonderful thing. I use Firefox because of the beauty of
open source, but I also love it for making amazing translation tools easy to use. The search I use most is
Wordreference. I set up a separate one for Sp>En and one for En>Sp. If you don't already have it you also must must set one up for the all powerful
RAE. There's the obvious dictionary.com (actually, to get there in firefox you can just type dict and the word in the address bar), and thesaurus.com. There's also
definr. For fun I like the
urban dictionary. What I've given you so far are links to the main sites for these pages. Some of these, like wordreference (at the very bottom of a page once you look up a word), have quick links on their pages for adding it to your firefox search bar. The RAE search is
here (huge kudos to the designer). For others go
here and search for them under all add-ons (lots of other cool ones to get while you're there).
Not in the search bar but also cool:
Visuwords graphs a word's relationship to other words. The
visual dictionary is good for learning terminology for tests (in theory these types of dictionaries are also good for when you know what it looks like and not what it's called - though I've never had much luck using them that way). If, like me, you still wonder if you want to lie or lay down, check out
confusing words. And for pronunciation dudas try the cool collective project of
forvo.