Examine source code of CMD-Q Catcher

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://addons.mozilla.org/en-US/firefox/addon/cmd-q-catcher/?src=api",
  "version": "0.5resigned1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "jid0-6YYzPEpNRrQkbg2A28X7j6hmcTA@jetpack",
      "strict_min_version": "48.0a1"
    }
  },
  "permissions": [
    "notifications",
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon64.png"
  },
  "commands": {
    "CMD-Q": {
      "suggested_key": {
        "default": "Ctrl+Q"
      },
      "description": "Caught CMD-Q Key-event"
    }
  },
  "default_locale": "en"
}