Mozilla Firefox has a Spanish dictionary add-on that works its spell-checking feature, thus assisting in detecting spelling errors.

It's not smart enough to be a professional translator's tool, so it's not entirely trustworthy, but it certainly detects little typos which everyone can make every now and then.

Once again, if you use it, don't trust it blindly!. Having said that, it might be useful for Firefox users.

where can i get that dictionary? is a complement or is standart?

Firefox has a standard, built-in spell checker.

The Spanish dictionary is a complement which works along with the spell checker.

So all you need to do to get Firefox to do spell checking in Spanish is to install the Spanish dictionary. You can get it (as well as other dictionaries) at the following address:

https://addons.mozilla.org/es-ES/firefox/

Select Diccionarios from the complements section and choose the dictionary you wish to install. There are two versions, actually. There\'s an Argentinian Spanish dictionary and there\'s a Spanish from Spain dictionary. Judging by the size, it looks like the latter is more complete (195kb vs. 290kb), but I know the Argentinian community here will appreciate the former. However I see no reason why you can\'t install both.