Examine source code of Hide Recent Tweets

{
  "manifest_version": 2,
  "name": "Hide Recent Tweets",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "1.0.0",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "applications": {
    "gecko": {
      "id": "hide-recent-tweets@devattendant.de"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*"
      ],
      "css": [
        "hide-recent-tweets.css"
      ]
    }
  ]
}