1.6.1 Can't Locate Gameplay Save File?

So I have a couple issues, but the title is the primary one.

To start off, I am building a game for instructional design / training purposes per HR for our company, and we are uploading it to our learning management system using Articulate Storyline (it works, we've tested it).

When testing the game (I have to test it using the index.html file in FireFox), I go to save the game, but no .rpgsavedata file or whatever that extension is supposed to be appears. In fact, there's not even a "save" folder in my project, during testing or HTML5 deployment. I'm pretty okay at reading and working in JS, but I can't seem to figure out which .js files handle the Save Game/Load game action.

Also, I wanted to use SomeRandomDude's "Reading/Writing Text Files" script after watching his video on YouTube. That being said, he mentioned he the code he used was stripped straight from the code used to create save files, but that was before v1.6.1. I would like to use that method to maintain a save game for cross-browser support, or different computers (in case IT needs to fix one). Does anybody know the location for this?

Browsers cannot save files directly to your computer (could you imagine if a browser could directly save a file from a website to your computer, for example, a virus!). That's why web browsers have a dedicated download process for downloading files.

Instead, when a RPG Maker MV game runs in a web browser, the save file is saved to the browser's local storage.

Just build a string-based save/load system and you'll be all set.