Examine source code of The Steak

{
  "manifest_version": 2,
  "name": "The Steak",
  "version": "1.10",
  "description": "'You know, I know this steak doesn't exist.' - Cypher. Removes What's Happening and Explore tab from Twitter.",
  "icons": {
    "48": "icons/steak.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*"
      ],
      "js": [
        "thesteak.js"
      ]
    }
  ]
}