Examine source code of Painless LeetCode

{
  "manifest_version": 3,
  "name": "Painless LeetCode",
  "version": "1.3",
  "description": "Block accidental submissions, hide difficulty labels, hide solved problems, and more.",
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.leetcode.com/*"
      ],
      "js": [
        "disable.js"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_title": "Open Random LeetCode Problem"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "painless-leetcode@nikaltipar",
      "strict_min_version": "121.0"
    }
  }
}