Found a resource you might be interested in: https://3p0ch.newgrounds.com/news/post/1086279
Testing this out today, thank you!
Edit: Got it working between versions. Still too early to tell if it will save between sessions, as I don't know exactly how long session cookies last by default. Testing it out on a test page so as to not screw with anything until I'm confident it is working fine
Edit2: Tested it out over a couple days, seems stable, seems to be working. The newest build has this system in place. Anyone reading this, please let me know if your data isn't saving between sessions