Examine source code of TabToggle

{
  "manifest_version": 2,
  "name": "TabToggle",
  "version": "1.1resigned1",
  "description": "Toggle tab",
  "icons": {
    "48": "icons/toggle-48.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/toggle-48.png",
    "default_title": "Toggle"
  },
  "commands": {
    "tab-toggle": {
      "suggested_key": {
        "default": "Alt+Q"
      },
      "description": "Send a 'tab-toggle' event"
    }
  },
  "background": {
    "scripts": [
      "tabtoggle.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8921e105-a5bb-42a2-9a0d-9a32a34785d3}"
    }
  }
}