Re: [w3c/ServiceWorker] consider allow late importScripts/import for local URLs (#1595)

> how WebExtensions upgrades relate to ServiceWorker upgrades

I can describe what happens currently in Chrome/Firefox.

All files in an installed extension (from the addon gallery) are frozen to their original installed content, it will never change, so AFAICT there is no need for the upgrade event in the service worker. That said, browser makers may want to offer a simplified hot reload for the service worker of a locally developed unpacked extension, but it's not implemented yet.

When the entire extension is updated (or the reload button is pressed on a locally developed unpacked extension), the browser simply uninstalls the old extension (retaining its data), and installs the new one.

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