Examine source code of Leet Cache

{
  "manifest_version": 2,
  "name": "Leet Cache",
  "version": "1.0.2",
  "description": "Utilize spaced repetiton to efficiently 'grind' LeetCode problems.",
  "icons": {
    "32": "assets/icons/leet-cache-32x32.png",
    "48": "assets/icons/leet-cache-48x48.png",
    "96": "assets/icons/leet-cache-96x96.png"
  },
  "browser_action": {
    "default_icon": "assets/icons/leet-cache-48x48.png",
    "default_title": "Leet Cache",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.leetcode.com/problems/*"
      ],
      "run_at": "document_start",
      "js": [
        "js/contentScript.bundle.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "open_in_tab": true
  }
}