Examine source code of Nitter Redirect

{
  "name": "Nitter Redirect",
  "description": "Redirects Twitter requests to Nitter, the privacy friendly alternative.",
  "version": "1.1.5",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "icons": {
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*",
        "*://www.twitter.com/*",
        "*://mobile.twitter.com/*",
        "*://pbs.twimg.com/*",
        "*://video.twimg.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://twitter.com/*",
    "*://www.twitter.com/*",
    "*://mobile.twitter.com/*",
    "*://pbs.twimg.com/*",
    "*://video.twimg.com/*"
  ],
  "browser_action": {
    "default_popup": "pages/popup/popup.html",
    "default_icon": {
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{513646f8-fb87-4135-a41e-4cf1d1ccccf2}"
    }
  }
}