Examine source code of tweets-only

{
  "manifest_version": 2,
  "name": "tweets-only",
  "version": "1.1resigned1",
  "description": "remove promoted tweets",
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/"
      ],
      "js": [
        "tweets-only.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ba974e1b-ccd4-47d1-ab2a-afd6706f8285}"
    }
  }
}