Examine source code of HagelKrantHelper

{
  "manifest_version": 2,
  "name": "HagelKrantHelper",
  "version": "1.3.2",
  "author": "RUSCG",
  "description": "Een betere school afwezigheidspagina voor hagelstein.",
  "browser_specific_settings": {
    "gecko": {
      "id": "@hagelkrant2-ruscg",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "/icons/HagelKrantHelper-16.png",
    "48": "/icons/HagelKrantHelper-48.png",
    "128": "/icons/HagelKrantHelper-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://hagelstein.sisofoscloud.be/krantLLN/*",
        "*://hagelstein.sisofoscloud.be/krantLKRN/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_title": "Open HagelKrantHelper website"
  },
  "web_accessible_resources": [
    "inject.js",
    "icons/HagelKrantHelper-500-transparent.png"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}