Examine source code of PI Spacer

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "images/logo.png",
    "default_popup": "index.html"
  },
  "default_locale": "en",
  "description": "Press The Spacebar",
  "icons": {
    "19": "images/19.png",
    "48": "images/48.png",
    "128": "images/128.png"
  },
  "manifest_version": 2,
  "name": "PI Spacer",
  "short_name": "PI Spacer",
  "version": "2.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2888e68-5f4b-4345-baf8-103f7f5adc7c}"
    }
  }
}