Examine source code of Blank Sample Add-on

{
  "manifest_version": 2,
  "name": "Blank Sample Add-on",
  "version": "1.0",
  "description": "This is a blank Mozilla add-on that does nothing.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Blank Add-on"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd3910d9-1b25-4d51-a60a-2a5af0009c38}"
    }
  }
}