Examine source code of PlankTab - New Tab

{
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "19": "icon_19px.png",
      "38": "icon_38px.png"
    },
    "default_title": "PlankTab"
  },
  "web_accessible_resources": [
    "newtab.html"
  ],
  "description": "New Tab page with animated background and the weather forecast",
  "icons": {
    "16": "planktab_icon-16px.png",
    "32": "planktab_icon-32px.png",
    "48": "planktab_icon-96px.png",
    "128": "planktab_icon-256px.png"
  },
  "applications": {
    "gecko": {
      "id": "{bfb74944-c9dc-46bf-b237-fe28408bc3d1}",
      "strict_min_version": "42.0"
    }
  },
  "content_security_policy": "script-src 'self';object-src 'self'",
  "manifest_version": 2,
  "name": "PlankTab - New Tab",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "<all_urls>"
  ],
  "version": "1.0.6resigned1"
}