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manifest.json

{
  "manifest_version": 2,
  "name": "Cycle through recent tabs",
  "description": "Use alt+shift+o and alt+shift+p to go forward or back (based on how recently that tab was accessed)",
  "version": "2.1.0",
  "icons": {
    "16": "icons/icon16.png",
    "19": "icons/icon19.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "commands": {
    "go-back": {
      "suggested_key": {
        "default": "Alt+Shift+O",
        "linux": "Alt+Shift+O"
      },
      "description": "Go to previously visited tab"
    },
    "go-forward": {
      "suggested_key": {
        "default": "Alt+Shift+P",
        "linux": "Alt+Shift+P"
      },
      "description": "Go to next visited tab"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{72cd6e40-d57d-4d4a-9e09-1c5f00df68b2}"
    }
  }
}