Examine source code of Fextralife Stream Blocker

{
  "manifest_version": 2,
  "name": "Fextralife Stream Blocker",
  "version": "1.0",
  "description": "Removes the annoying fextralife stream from all fextralife pages",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.fextralife.com/*"
      ],
      "js": [
        "removal.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{51ec8dd3-50ba-4d0c-8c46-90694a65a72a}"
    }
  }
}