Examine source code of Tweet Reminder

{
  "description": "Schedule reminders for tweets while browsing twitter.com and receive notifications from your reminders.",
  "manifest_version": 2,
  "name": "Tweet Reminder",
  "version": "1.0.4resigned1",
  "author": "Non Stock Productions",
  "homepage_url": "https://tweet-reminder.nonstockproductions.com",
  "icons": {
    "16": "icons/logo-16.png",
    "32": "icons/logo-32.png"
  },
  "permissions": [
    "identity",
    "notifications",
    "storage",
    "alarms",
    "tabs"
  ],
  "background": {
    "scripts": [
      "webextension-polyfill/dist/browser-polyfill.js",
      "background/storage.js",
      "background/main.js",
      "background/authorize.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/logo-error-16.png",
      "32": "icons/logo-error-32.png"
    },
    "default_title": "Tweet Reminder"
  },
  "web_accessible_resources": [
    "icons/logo-16.png",
    "icons/logo-32.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f41a5648-b508-4a4e-9e87-ece341964c08}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*"
      ],
      "js": [
        "webextension-polyfill/dist/browser-polyfill.js",
        "content-scripts/tweet-reminder.js"
      ]
    }
  ]
}