Examine source code of Roblox Server List

{
  "manifest_version": 2,
  "name": "Roblox Server List",
  "version": "4.9",
  "description": "Roblox Server List",
  "icons": {
    "48": "icons/icon.png"
  },
  "applications": {
    "gecko": {
      "id": "Roblox@ServerList.ru",
      "strict_min_version": "80.0"
    }
  },
  "permissions": [
    "<all_urls>",
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.roblox.com/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Roblox Server List",
    "default_popup": "popup/popup.html"
  }
}