To use the save editor:
Init the default save files in your browser
Start a new game and reach a save point
Save and quit to the menu
Change something in the options menu
Reload your webpage
Press load above to load the newly created
localstorage files
Select the file you wish to modify(will 
overwrite these instructions)
Make any changes you want!(So long as json 
remains valid)
If you break the json, it is 
non-recoverable so you will have to reset
your cache
You are also free to play the game without
making any modifications if you so choose
After making changes, press "Save Content",
then press "Save", then reload
Your changes will take effect within the 
game once it restarts