Examine source code of Reddit Bro

{
  "manifest_version": 2,
  "name": "Reddit Bro",
  "version": "1.7.2",
  "description": "Reddit Bro – Unique Feed and Bulk Save (download)",
  "permissions": [
    "https://*.reddit.com/*",
    "https://*.redd.it/*",
    "https://*.redgifs.com/*",
    "https://*.rapidsave.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Reddit Bro",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "web_accessible_resources": [
    "icons/icon32.png",
    "icons/icon128.png"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.reddit.com/*",
        "https://old.reddit.com/*"
      ],
      "js": [
        "js/base.js",
        "js/www.js",
        "js/old.js",
        "js/download.js",
        "js/run.js",
        "js/jszip.js"
      ],
      "css": [
        "css/base.css",
        "css/download.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.redgifs.com/*",
        "*://*.rapidsave.com/*"
      ],
      "js": [
        "js/communicator.js",
        "js/popupalive.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://www.redgifs.com/ifr/*"
      ],
      "js": [
        "js/redgifs-stop-autoplay.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "redditbroextension@gmail.com",
      "strict_min_version": "121.0"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}