Examine source code of Clip LeetCode

{
  "content_scripts": [
    {
      "js": [
        "main.js"
      ],
      "matches": [
        "*://*.leetcode.com/problems/*"
      ]
    }
  ],
  "description": "Copy the LeetCode problem to your clipboard.",
  "icons": {
    "128": "icon.png"
  },
  "manifest_version": 2,
  "name": "Clip LeetCode",
  "version": "1.0.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f916e01a-70a7-4b73-a9f9-786ea6acb03d}"
    }
  }
}