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manifest.json
{
  "manifest_version": 3,
  "name": "One Tab per Window",
  "version": "0.1.0",
  "permissions": [
    "tabs"
  ],
  "description": "When a new tab is opened, redirects it to a new window instead.",
  "browser_specific_settings": {
    "gecko": {
      "id": "onetab@nonexistenturl.net"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "browser_style": true,
    "default_icon": "icon.svg",
    "default_title": "One Tab",
    "default_popup": "popup.html"
  }
}