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Can't remove US English

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I've just added UK English and restarted Firefox. Now, why can I not remove US English, even though that one shouldn't be in use, and I still can remove UK English, even though that one *is* in use (or should be)?

Greying out a button is only recommended when it's crystal clear why that is. In this case, I have no clue why I couldn't remove US English, and so gryeing out that button makes no sense to me. It should be enabled, and display a message explaining why a language can't be removed if it can't be.

For the moment, can someone please explain why US English can't be removed then?

I've just added UK English and restarted Firefox. Now, why can I not remove US English, even though that one shouldn't be in use, and I still can remove UK English, even though that one *is* in use (or should be)? Greying out a button is only recommended when it's crystal clear why that is. In this case, I have no clue why I couldn't remove US English, and so gryeing out that button makes no sense to me. It should be enabled, and display a message explaining why a language can't be removed if it can't be. For the moment, can someone please explain why US English can't be removed then?
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I also have this problem - somebody in an archived thread said you need to clear caches through a command line but the link to the command line explainer page was broken. Did you manage to fix this?

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This is likely because you use the en-US Firefox release. You can't remove the default language, you can only remove languages you added yourself to this panel.

If you do not want to show en-US, but only want to see en-GB then install the en-GB version and not the en-US version and the en-GB language pack like the OP probably did.

You can find the full version of the current Firefox release (92.0) in all languages and all operating systems here: