Thanks! We wrote a custom Parcel runtime [1] inspired by Parcel's HMR runtime (which was too bloated and buggy for us) that injects a web socket listener into the development build of the extension.

Whenever a bundle change happens, Parcel sends it the refresh message and it either does `chrome.runtime.reload()` or `location.reload()` depending on the context.

[1]: https://github.com/PlasmoHQ/plasmo/blob/main/packages/parcel...