Okay I'm going a little insane here. I have been working on the next major release of my Mythras sheet which is a complete rewrite from the ground up and started working on some of the sheet worker stuff. I found that that the sheet workers did not appear to be running at all. No console logs are showing up in the console. To debug I started breaking things down into more simple tests. Eventually I created a fresh new campaign, disabled all my extensions, started with a new browser profile and reduced the custom sheet code down to: <div></div> <script type=text/worker> on('sheet:opened',function(){ console.log("Sheet worker test"); }); </script> Still I am getting no "Sheet worker test" in the console. My console logs are: <a href="https://pastebin.com/DSq9qifG" rel="nofollow">https://pastebin.com/DSq9qifG</a> Any clue why this may not be working?