Don't Send Yet!

If you happen to send an unintentional email to someone who's out of your organization (here and there) - the "Don't Send Yet!" is…

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Don't Send Yet!",
  "description": "",
  "version": "1.0",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon-128.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png",
    "256": "icon-256.png"
  },
  "permissions": [
    "storage",
    "notifications"
  ],
  "web_accessible_resources": [
    "alert.mp3"
  ]
}