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manifest.json

{
  "manifest_version": 2,
  "name": "X/Twitter – Open Posts in Background Tab",
  "version": "1.0",
  "description": "Clicking any post in the X/Twitter feed opens it in a new background tab instead of navigating away.",
  "browser_specific_settings": {
    "gecko": {
      "id": "x-background-tabs@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "*://*.twitter.com/*",
    "*://*.x.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*",
        "*://*.x.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  }
}