I use a free tool called VeresClick (https://av1611.com/verseclick/), all you have to do is place it in the heading line of the code and it will then do pop-up windows of the text in KJV. It is designed to work off of a server, but works really well with local files viewed in a browser as long as you have internet access. I have a nice collection of e-books in PDF and HTML format; I modified the HTML based ones and now they all have this feature. Plus if you do not have access to the Internet, it does not effect the reading of the document.
I just thought I would share!
.\\itch - Lev. 19:11 Ye shall not steal, neither deal falsely, neither lie one to another.