Add quotes and copy

manifest.json

{
  "manifest_version": 2,
  "name": "__MSG_ext_name__",
  "description": "__MSG_ext_desc__",
  "version": "1.2",
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "contextMenus"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}