Ok, I've managed to fix this on chrome:
Step 1: F12 to open the console and click on the link in "at load (main.js:227)" - the sources panel should be open now.
Step 2: Turn on Local Overrides: The second panel bar should say "Pages" on the left, change this to "Overrides". On this sub panel you'll need to set an override folder, and then confirm the changes.
Step 3: "main.js" should still be open - scroll to the bottom and add "//" to the start of the line that says "w.load(JSON.parse(state));"
Step 4: Reload the web page. The game should work! But, while it saves now, it no longer loads.
Step 5: In the override folder on the left panel, delete the main.js file. Reload the web page. You should be good!