Examine source code of Heading Tag Markup

{
  "name": "Heading Tag Markup",
  "version": "1.4resigned1",
  "manifest_version": 2,
  "description": "This extension visual highlights the h-Tag on every page.",
  "permissions": [
    "https://*/*",
    "http://*/*",
    "tabs",
    "storage"
  ],
  "icons": {
    "128": "data/h-tag.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "data/heading.js"
      ],
      "css": [
        "data/heading.css"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "data/popup.html",
    "default_title": "Heading Tag Settings"
  },
  "applications": {
    "gecko": {
      "id": "info@webreload.de"
    }
  }
}