I speak English. I am living in Chile and have a Dell/MS Windows Vista (English) laptop. I have Firefox 3.6.12. I have installed the Spanish (Mexico) dictionary. I right-click in a Yahoo e-mail window and select Languages - Spanish (Mexico) and start typing in Spanish, but it is not correcting my mistakes, or offering alternative spellings.

I don't know if I have the correct plug-in, correct settings, or am expecting something that isn't possible.