Fix my Twitter!

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "description": "Gets back Twitter's old design by changing the useragent string",
  "manifest_version": 2,
  "version": "1.2",
  "name": "Fix my Twitter!",
  "icons": {
    "48": "img/48.png",
    "96": "img/96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "permissions": [
    "https://twitter.com/*",
    "webRequest",
    "webRequestBlocking",
    "browsingData"
  ]
}