Examine source code of QuickReply for Reddit

{
  "manifest_version": 2,
  "name": "QuickReply for Reddit",
  "version": "1.2.1",
  "description": "Quickly reply to comments and submissions from multiple accounts without logging off.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background_script.js"
    ]
  },
  "options_ui": {
    "page": "./options.html",
    "browser_style": true
  },
  "permissions": [
    "storage",
    "webRequest",
    "notifications",
    "tabs",
    "https://oauth.reddit.com/*",
    "https://reddit.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c1ad00b-2bb7-48a3-8819-79cc698278db}"
    }
  }
}