How do I enable a spell-checker in Spanish when on websites?

I used to have this feature on my old laptop, but it recently gave up the ghost so now I'm having to reinstall everything. So for example, on reddit, whenever I type in Spanish, every word is underlined as if it were misspelled. I've got the language pack installed but I'm not sure what else to enable in order to make it NOT think every time I write in spanish, I'm making major spelling errors.

submitted by /u/loves_spain
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