Thanks!
Electric Zine Maker is a funky little tool for sure- although I admit that sometimes I bring my pages into Photopea for some features like drop shadowing or fonts not on my machine and don't feel like hunting/downloading new ones. And layers! Ooooooh how I want EZM to have layers after a commit!
For the in brower player/preview, it's actually not something attached to EZM officially. It's a nifty ZIP file by another itch user where you essentially drop your pages into a little folder, adjust some basic JavaScript (if needed), and rezip the file. Since it's made with EZM in mind, it follows it's naming conventions for pages, but it's super easy to use it with other zine making methods because of relying on individual pages and optionally telling JavaScript where to look.