Examine source code of wfmt_mod

{
  "name": "wfmt_mod",
  "version": "1.27",
  "description": "Erweitert WFMT: verarbeitet den xml-String (v.a. für Firefox), passt das Design an",
  "manifest_version": 2,
  "content_security_policy": "script-src 'self' 'sha256-qnpg1RrlojR6MYt5h460dnQnb8z3JzFws4t274JBMow='; object-src 'self'; style-src 'self' 'sha256-qnpg1RrlojR6MYt5h460dnQnb8z3JzFws4t274JBMow='; frame-src 'https://iwan.telekom.de/'",
  "icons": {
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "64": "icons/icon_64.png",
    "96": "icons/icon_96.png"
  },
  "browser_action": {
    "default_icon": "icons/icon_32.png",
    "default_title": "WFMT-Mod",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "web_accessible_resources": [
    "icons/*.png",
    "content_scripts/inject.html",
    "content_scripts/inject.js",
    "popup/Druckvorlage.html",
    "popup/druckvorlage.js",
    "content_scripts/mod_color.css",
    "content_scripts/mod_tableSize.css",
    "content_scripts/mod_tableBorder.css",
    "content_scripts/mod_menu.css"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://wfmt-prod.telekom.de/midtier/*",
        "https://wfmt-schu.telekom.de/midtier/*",
        "https://wfmt-abn1.telekom.de/midtier/*",
        "https://nimbus.telekom.de/*",
        "https://nimbus2002.telekom.de/*"
      ],
      "js": [
        "content_scripts/wfmt_mod.js"
      ],
      "css": [
        "content_scripts/inject.css"
      ]
    }
  ],
  "permissions": [
    "clipboardWrite",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b33b81fe-011f-4584-83ea-ce42c1d75d3f}",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    }
  }
}