I'm an author, publishing through KDP since 2022. As a UK resident, I publish initially on amazon.co.uk, after which Amazon sends the ebooks and print books to amazon.com and so forth. However, when I view the books on the US site, they are shown as 'currently unavailable.' This only happens in Firefox. I also use Chrome now and again, and it's fine there. The books clearly are available, because US readers buy them. But clearly I don't want to risk any US Firefox readers thinking they're unavailable, if they have the same problem that I'm having. I raised this with Amazon a while ago, but they said it was nothing to do with them, and must be an issue with my browser. I've recently published the third book in a series, and it's just the same. Any suggestions?