How do I convert a word document into a single .html web page?

My title needs some elaboration.

I don't want the "single webpage" option, as that creates an mht file In Microsoft Word, and while Chrome can open it, I see the Firefox has issues

Here's the file as a docx https://we.tl/XN4V8w6flT or from ge.tt http://ge.tt/8r0iFNd2 though that can easily be created just by having some text and highlighting part of it . And that's just a demonstration file, I may have lots more text and lots more blocks of text highlighted.

I don't want an MHT file 'cos firefox doesn't open it straight away, and if I want to send it to somebody then I think an html file is more compatible.

I can get Word to produce an html webpage but then it makes a subdirectory with these xml files in it. I don't want that, I want one file.

How can I integrate these xml files or their equivalent, into an html file?

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