Examine source code of No Gender

{
  "name": "No Gender",
  "description": "Entfernt diverse Arten des \"Gendern\" auf Webseiten.",
  "version": "1.9",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content/app.js",
        "content/list.custom.js",
        "content/list.plural.js",
        "content/list.singular.js",
        "content/script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "/assets/logo_16.png",
      "32": "/assets/logo_32.png",
      "48": "/assets/logo_48.png",
      "128": "/assets/logo_128.png"
    },
    "default_title": "no-gender",
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "16": "/assets/logo_16.png",
    "32": "/assets/logo_32.png",
    "48": "/assets/logo_48.png",
    "128": "/assets/logo_128.png"
  }
}