Disable Page Visibility API Firefox

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manifest.json
{
  "applications": {
    "gecko": {
      "id": "{DEBA3021-9876-4702-89BA-42D095339A0A}",
      "strict_min_version": "57.0"
    }
  },
  "author": "Frank Dreßler",
  "manifest_version": 2,
  "name": "Disable Page Visibility API",
  "version": "1.2resigned1",
  "description": "Disables the Page Visibility API.",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "conent_script.js"
      ]
    }
  ]
}

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