Examine source code of emojis typer

{
  "manifest_version": 2,
  "name": "Tab Unloader",
  "version": "5.0.2",
  "description": "Instantly unload the current tab to free memory. Press your shortcut, done.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{78386305-bdb7-4b78-b336-4960014765d1}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "alarms"
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon_16.png",
      "32": "icons/icon_32.png",
      "48": "icons/icon_48.png"
    },
    "default_title": "Tab Unloader"
  },
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "64": "icons/icon_64.png",
    "128": "icons/icon_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "commands": {
    "unload-tab": {
      "suggested_key": {
        "default": "Alt+Shift+U"
      },
      "description": "Unload the current tab"
    }
  }
}