Examine source code of Traittor Redirect

{
  "manifest_version": 3,
  "name": "Traittor Redirect",
  "version": "1.0",
  "description": "Redirect Twitter link to Traittor link. Bypass Twitter account and read limit per day.",
  "browser_specific_settings": {
    "gecko": {
      "id": "traittorcontact@gmail.com"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Show settings",
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*",
        "*://*.twitter.com/*"
      ],
      "js": [
        "inject/injected.js"
      ],
      "run_at": "document_start"
    }
  ]
}