Favorite vs Favourite
My Linux computer's browser spellcheck prefers one.
My Windows computer's browser spellcheck prefers the other.
I bet it is an easy fix, but I don't think it needs fixing. I'm fine having an accent on one computer. By the way, and this is true, I cannot hear a British accents any more. I'm certain because I've watched so much British programming (TV, movies). So maybe it's just BBC English?
I still hear Welsh, Scottish and Irish accents and they are beautiful to hear.
Extending that thought, one of my biggest regrets is that I have problems translating Indian accents, which are rooted in British English. I use be so embarrassed and apologise when talking to tech support from India. I knew it was my problem, not theirs. Where I get BIG HEADED about that is my co-workers blamed workers for India. I did not, do not, envy their jobs as help desk personnel. But I felt bad I had to keep asking them to repeat themselves. It's also interesting how worker from India handled my inability to process language. Just like everything else with everyone else everywhere, some were offended, some were understanding.
Color vs Colour
At least it's not Celsius vs Fahrenheit. That's another language, and it is one I think I can handle, and I'm getting better.
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Acronym Legend
OS = Older Son, YS = Younger Son
The most important two acronyms I know.