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I've followed the FAQ but it doesn't spell check anything and all words come up underlined. Yes, I have selected English (GB) in the spell check settings; yes, I have uninstalled any other dictionaries (I even removed the Firefox GB Language pack as well); I've tried uninstalling and reinstalling several times with no change.

I've had to go back to the standard GB Language pack with a (bizarrely) US dictionary - at least the majority of words are checked now :-(

EDIT:
Can't reply to the comment below directly but I've tried manually installing the addin as per the instructions but there is no difference.

EDIT 2:
Yes, as mentioned in the original post, I have selected the Dictionary/Language for Spellchecking in an editable field - This is when it switches from just highlighting non-US words to highlighting every word so I know it's made the switch (It just doesn't accept any words as spelled correctly).

Esta análise é para uma versão anterior da extensão (2.59). 

Hello Zog,

Could you try the steps explained in:
http://marcoagpinto.cidadevirtual.pt/en_installing.html
?

Please tell me if this solves your issue.

Thanks.

EDIT: Make sure you have installed on Firefox if it is to be used there. Then, right-click in an editable text area just like this one when you writing in it, and select: "Languages" -> "English (United Kingdom)"