Examine source code of Simple Hotkey Assigner

{
  "manifest_version": 2,
  "name": "Simple Hotkey Assigner",
  "version": "1.0",
  "description": "Assign custom hotkeys to perform basic actions on a webpage.",
  "background": {
    "scripts": [
      "popup.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4391473e-f473-4b1f-9bfa-810a13b925b1}"
    }
  }
}