Examine source code of Ctrl-F Plus: Ctrl + F Search

{
  "manifest_version": 2,
  "name": "Ctrl-F Plus: Ctrl + F Search Across All Tabs",
  "short_name": "Ctrl-F Plus",
  "description": "Find words and phrases across ALL your open tabs! 🔍",
  "version": "1.0.6",
  "author": "Ctrl-F Plus",
  "homepage_url": "https://ctrl-f.plus",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "all_frames": false,
      "js": [
        "layover.js",
        "highlightStyles.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "scripting"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "MacCtrl+Shift+F",
        "chromeos": "Ctrl+Shift+F",
        "linux": "Ctrl+Shift+F"
      },
      "description": "Start the extension"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{9bb1c89d-b02d-4eee-ba5a-181452e5e0e6}"
    }
  }
}