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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Open Tabs",
  "short_name": "Open Tabs",
  "description": "Open Tabs lets you create groups of tabs, save them across multiple devices, and reopen later.",
  "version": "1.1.1",
  "homepage_url": "http://www.opentabs.io/",
  "offline_enabled": true,
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "browser_action": {
    "default_title": "Open Tabs",
    "default_popup": "popup.html",
    "default_icon": {
      "19": "images/icons/icon19.png",
      "38": "images/icons/icon19@2x.png"
    }
  },
  "icons": {
    "16": "images/icons/icon16.png",
    "48": "images/icons/icon16@3x.png",
    "128": "images/icons/icon16@8x.png"
  }
}