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manifest.json
{
  "author": "igorlogius",
  "homepage_url": "https://github.com/igorlogius",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_area": "navbar"
  },
  "commands": {
    "Duplicate Tabs": {}
  },
  "description": "Prevent opening tabs with urls, which are already open within the same context",
  "icons": {
    "128": "icon.png"
  },
  "manifest_version": 2,
  "name": "Dont Open Duplicate Tabs",
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "menus",
    "cookies",
    "storage",
    "tabs"
  ],
  "optional_permissions": [
    "notifications"
  ],
  "version": "1.8.22",
  "browser_specific_settings": {
    "gecko": {
      "id": "{83d63d9e-824f-49b4-9c28-468b9fb2f300}"
    }
  }
}