Examine source code of tpb-x

{
  "manifest_version": 2,
  "name": "tpb-x",
  "version": "1.1resigned1",
  "description": "Remove TPB ads and highlight new movie titles",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.thepiratebay.org/*",
        "*://*.uj3wazyk5u4hnvtk.onion/*"
      ],
      "js": [
        "tpb-x.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3f71d61a-02a9-40bc-93c6-45485a883078}"
    }
  }
}