Examine source code of EnhanceCF

{
  "manifest_version": 2,
  "name": "EnhanceCF",
  "version": "2.1resigned1",
  "description": "Small enhancements for Codeforces. Adds a 'copy' button in sample test cases and 'All submissions' button on problem pages",
  "icons": {
    "48": "icons/index.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.codeforces.com/problemset/problem/*",
        "*://*.codeforces.com/contest/*/problem/*"
      ],
      "js": [
        "enhance.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4ee2ce94-c27a-45bf-8ed7-9d6b8c3aaf4f}"
    }
  }
}