I'm working on this and I hope it'll be ready within a week or so. I thought it's a 10 minutes job as someone else here said, but I must be much slower than that and I'm still trying to get my head around it. The Extension Compatibility Test for Firefox page seems to freeze when I test my .crx file. Drop me an email on the Contact page (https://mycognitivebias.com/get-in-touch/) and I'll let you know when it's ready. Thanks