Looking for a spellchecker extension

I use Firefox primarily and want to use a spellchecker extension for it but I wanted some advice from people who've used certain ones. It would be great to have one that includes both American and British spelling because living in Australia I spell primarily the British way and I usually just correct it here to the American spelling because I don't like the look of the red lines under the word(s). I realize this site has one but one more for me would be a good addition and can be used for general Firefox usage.

Look here

https://addons.mozilla.org/en-US/firefox/browse/type:3

I use the British English and it works fine.

I've tried the US English and it too is OK


I've never touched the Aussie one ( even reading a rising intonation is like fingernails on a blackboard )

Thanks!
I've installed the Australia one and what does this mean?

( even reading a rising intonation is like fingernails on a blackboard )

Thanks!
I've installed the Australia one and what does this mean?

( even reading a rising intonation is like fingernails on a blackboard )

It means I'm not the best lover of the way that Aussies torture the English tongue , love the people, hate the accent .

I'll try to overlook that you're not a fan of Alf from Home and Away.

I'll try to overlook that you're not a fan of Alf from Home and Away.

My wife has banned all things Australian from the TV, she reckons we go through too many screens when they're on. [external image: Posted Image] (sorry, this was the closest smiley I could find)