Examine source code of Dan Field

{
  "manifest_version": 2,
  "name": "Danfield",
  "version": "1.0.2",
  "description": "Module Mozilla Firefox officielle de la chaine youtube DanField. Celui-ci vous permetras de gagner du temps en ajoutant divers racourcis vers les médias de Dan.",
  "icons": {
    "48": "icons/danico.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/danico.png",
    "default_title": "Danfield",
    "default_popup": "popup/index.html"
  },
  "web_accessible_resources": [
    "img/background00.png"
  ]
}