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I've just installed this 'British' dictionary, and I've already found issues with it. I tested it with a few words to see if it worked, and one of the words I tested was COLOUR. It tells me that the correct spelling should be COLOR. We British spell the word COLOUR, not COLOR.

How is this a British Dictionary?

Questa recensione riguarda una versione precedente (1.19.1) del componente aggiuntivo.  Questo utente ha inserito 2 recensioni precedenti su questo componente aggiuntivo.

"colour" really is in the dictionary. Have you installed it correctly?

See
http://support.mozilla.com/en-US/kb/Using%20the%20spell%20checker
particularly the sections on Adding and Switching dictionaries.