Is it UK English that you use ? US English is not grammatically correct ?
There is nothing more to ask, this is a very simple and direct question for Mozilla/Firefox.
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In what context? This website? Firefox on a mobile device? If so what device? Firefox on a desktop/laptop? In general Firefox has a UK translation and it should be automatically selected if you are in the UK or your device is set to the UK language.
The differences between UK and US English are very distinctive. Most sites give the option to change even when one is on the US side of the pond. But I haven't found one on Firefox as yet. If there is one please let me know, I would be most grateful.