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manifest.json
{
  "name": "Backspace Shortcut",
  "version": "1.0",
  "manifest_version": 2,
  "description": "It makes the backspace key a 'back' shortcut. It's pure and fast. No spying. No configuration. Open-source.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}