Examine source code of Blue checks for everyone!

{
  "description": "Blue checks for everyone!",
  "manifest_version": 2,
  "name": "Blue checks for everyone!",
  "version": "1.2",
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*",
        "*://mobile.twitter.com/*",
        "*://twitter3e4tixl4xyajtrzo62zg5vztmjuricljdp2c5kshju4avyoid.onion/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Blue checks for everyone!",
    "default_icon": {
      "48": "logo48.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9571eb89-1864-4e7c-bcb6-56beee982aa3}"
    }
  }
}