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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Email Eye - Email Tracker for Gmail",
  "description": "Track who opens your emails in Gmail for free in realtime!",
  "version": "1.0.2",
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "opened.png",
        "unopened.png",
        "tracking.png",
        "untracking.png"
      ],
      "matches": [
        "https://mail.google.com/*"
      ]
    }
  ],
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "https://mail.google.com/",
    "*://*.boostextensions.com/*",
    "https://boostextensions.com/*"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "manifest_version": 3
}