Disable visibility detection

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Disable visibility detection",
  "description": "Prevent website from accessing itself visibility info",
  "version": "1.0.0",
  "author": "Jacques De SAGAN",
  "manifest_version": 2,
  "permissions": [
    "*://*/*"
  ],
  "icons": {},
  "web_accessible_resources": [
    "/disable-visibility-detection.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "js": [
        "content.js"
      ]
    }
  ]
}