As a hardcore Spanish learner I was looking for a tool like this for quite a while. Although I mainly use it to look up things in the WordReference dictionary, it's also a great tool for everyone who wants to immerse him/herself with native materials, as it contains links to the best Spanish resources on the web.
I just spent an hour trying to figure out how to add a tilde, upside down exclamantion and question marks. This toolbar INSTANTLY does that for you. Amazing. Many features. Will use this a lot! Excellent!
Finally a toolbar that does not have insidious ends and did I mention that it's actually helpful?! The News, Reference and Video links on the toolbar are also pretty decent and beneficial if you are attempting to increase your Spanish proficiency. Try it out and get acquainted with its many useful features, it does not have an overwhelming amount of features which is good. One last thing, I does not seem to slow down my browser. Thank you for this well thought of addon!