Examine source code of StudeerFree

{
  "manifest_version": 2,
  "name": "StudeerFree",
  "version": "1.0.2",
  "content_scripts": [
    {
      "matches": [
        "*://*.studeersnel.nl/*"
      ],
      "js": [
        "/content_script.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "48": "/favicon.png"
    },
    "default_title": "StudeerFree",
    "default_popup": "/popup.html"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4afa82f8-d1ab-47d4-98d3-98afadc62b0f}"
    }
  }
}