One of the focus areas for this year is IndexedDB. And many of the other areas contain tests for service workers. I don't think it's accurate to say anyone's dragging their feet. Apple's done a 180 on PWAs in the past year. I also don't know what you mean about Firefox dropping pwa support. They've been hard at work improving the PWA scene for years now. And they're docs are the go-to for anyone working on one
