How To Add to Website Using Local ROMS

I want to embed Nesbox onto my Blogger. However, I do not want to host a single ROM. I want to use a version of Nesbox that lets you provide your own ROMS. This version is seen at [https://nesbox.github.io/emulator/flash/](https://nesbox.github.io/emulator/flash/), but I can't seem to find the code for that version. Is there a version of this code that I can find somewhere?