Examine source code of Tithonus

{
  "manifest_version": 2,
  "name": "Tithonus",
  "version": "2.0",
  "description": "Extension for Twitter that subjects tweets loaded with infinite scroll to decay.",
  "icons": {
    "48": "icons/cricket.png",
    "96": "icons/cricket@2x.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/cricket.png",
    "default_title": "Tithonus - Twitter Decay",
    "default_popup": "popup/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tithonus@kescher.github.io",
      "strict_min_version": "42.0"
    }
  },
  "background": {
    "scripts": [
      "tithonus_background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "tithonus.js",
        "jquery-3.3.1.slim.min.js"
      ]
    }
  ]
}