Examine source code of Leetforge

{
  "manifest_version": 2,
  "name": "Leetforge",
  "version": "0.0.5",
  "description": "Leetforge: Sign in with GitHub, pick or create a repo, and sync accepted LeetCode solutions as commits.",
  "permissions": [
    "storage",
    "notifications",
    "tabs",
    "https://leetcode.com/*",
    "https://leetcode.cn/*",
    "https://github.com/*",
    "https://api.github.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "welcome.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_title": "Leetforge",
    "default_icon": "icon.png"
  },
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://leetcode.com/*",
        "https://leetcode.cn/*"
      ],
      "js": [
        "content/leetcode.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "78.0",
      "id": "{70694b9b-992c-4b89-804c-c8b533062614}"
    }
  }
}