Extract URL from Query String Firefox

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manifest.json
{
  "name": "Extract URL from Query String",
  "description": "Adds a command to the right-click context menu for links that searches for an URL encoded in the query string and, if found, open it",
  "version": "1.0",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "contextMenus"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}

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