Examine source code of Müsi Filter

{
  "name": "Müsi Filter",
  "version": "1.0.0",
  "version_name": "1.0.0",
  "description": "Ausblenden einzelner Posts, Threads, Autoren oder Foren in Listen auf muenchnersingles.de",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "author": "Stefan Sonntag",
  "content_scripts": [
    {
      "js": [
        "jquery-3.4.0.slim.js",
        "content.js"
      ],
      "matches": [
        "https://www.muenchnersingles.de/*",
        "http://www.muenchnersingles.de/*"
      ]
    }
  ],
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "muesifilter@sonntag-online.com"
    }
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon16.png"
  },
  "permissions": [
    "activeTab",
    "http://muenchnersingles.de/*",
    "https://muenchnersingles.de/*",
    "storage"
  ]
}