JSON to HTML conversion is mostly encountered in scenarious when user tries to transfer bookmarks from Firefox to another web browser, in cases when a direct export / import is not possible, due to faulty hardware or operating system. You will need a bookmark conversion utility such as Transmute for that.
Alternative route to achieve convert json to html would be to locate the original profile and copy the data to the new computer as well as install both Firefox and Chrome. When you launch Chrome you will have the opportunity to directly import bookmarks from Firefox.Open JSON file Open HTML file
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