Examine source code of Code or Die

{
  "name": "Code or Die",
  "description": "An extension to view the activity of your friends on LeetCode.",
  "version": "1.1",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "codeordie@leetcode.extension",
      "strict_min_version": "109.0"
    }
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": "icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://leetcode.com/*"
  ],
  "icons": {
    "16": "icon16.png",
    "19": "icon19.png",
    "32": "icon32.png",
    "38": "icon38.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}