Unique Tab

Makes sure that the same url is only open once across all tabs

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Unique Tab",
  "version": "1.0",
  "description": "Makes sure that the same url is only open once across all tabs",
  "permissions": [
    "declarativeContent",
    "storage",
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "options_page": "options.html",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "manifest_version": 2
}