Migrating to Manifest v3

[Mikescops]

Hello,

First of all, thanks for this great tool, I use it a lot to kickstart some small projects.

Soon we will all be forced to migrate to manifest v3 so I'm looking into what are the steps needed to still be using neutrino-webextension and hopefully have a smooth transition.

The migration is described by Google here.

The most impacting change is the migration from the background page to a service worker, as described here.

Here are a few extension samples : chrome-extension project

Let me try to sum up the changes in the manifest (I might miss some things):

{
  "background": {
    "scripts": [
      "assets/browser-polyfill.min.js",
      "assets/runtime.d8dd73ab.js",
      "assets/1.7fa210ac.js",
      "assets/background.afd2ca50.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "manifest_version": 2
}

becomes

{
  "background": {
    "service_worker": "assets/worker.js",
  },
  "action": {
    "default_popup": "popup.html"
  },
  "manifest_version": 3
}

The entire checklist is available here.

I'll try to have this working and make a PR if possible.

[Mikescops]

The main issue being having all the current scripts into one service worker file.