Examine source code of Reddit Masstagger

{
  "manifest_version": 2,
  "name": "Reddit Masstagger",
  "description": "This extension will identify far-right users on reddit.com",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "version": "1.2.3.7",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "lib/jquery.js",
        "masstagger.js"
      ]
    },
    {
      "matches": [
        "*://*.masstagger.com/user/*"
      ],
      "css": [
        "lib/jquery-ui.css"
      ],
      "js": [
        "lib/jquery.js",
        "lib/jquery-ui.js",
        "whitelist.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png"
    }
  },
  "permissions": [
    "storage",
    "clipboardWrite",
    "http://*.reddit.com/*",
    "https://*.reddit.com/*",
    "http://masstagger.com/",
    "https://masstagger.com/"
  ]
}