Examine source code of Reduce Twitter

{
  "manifest_version": 2,
  "name": "Reduce Twitter",
  "description": "Reduce/eliminate Twitter interactions like comment, retweet, like, new tweet. You can remove or disable them.",
  "homepage_url": "https://github.com/moudev/reduce-twitter",
  "version": "0.0.1",
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "default_title": "Reduce Twitter",
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "storage"
  ]
}