Examine source code of LeetCode AC Count

{
  "name": "LeetCode AC Count",
  "description": "Displays total number of solved problems for each difficulty. Also includes/excludes the Locked problems as per the preferences",
  "version": "1.0.1",
  "manifest_version": 2,
  "icons": {
    "128": "./icons/icon128.png"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "*://leetcode.com/tag/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "bundle.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7adabf83-9425-42b4-ab8e-533c31b9931c}"
    }
  }
}