Examine source code of Forward button

{
  "description": "Forward button",
  "manifest_version": 2,
  "name": "Forward-button",
  "version": "1.0",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/right_16.png",
      "32": "icons/right_32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b7c0973c-0820-4e43-a2a9-bf69a68d4bb2}"
    }
  }
}