Examine source code of WhatImean

{
  "name": "WhatImean",
  "version": "1.0.37.0",
  "manifest_version": 2,
  "description": "Rechtschreibprüfung, Grammatikprüfung und Stilprüfung - überall im Web",
  "default_locale": "de",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "icons": {
    "16": "images/whatimean-logo-16.png",
    "48": "images/whatimean-logo-48.png",
    "128": "images/whatimean-logo-128.png"
  },
  "options_ui": {
    "page": "/options/options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "https://navigator.web.de/*",
        "https://navigator.gmx.net/*",
        "https://*.navigator.gmx.net/*",
        "https://*.navigator.web.de/*",
        "https://wordpress.com/*",
        "https://teams.microsoft.com/*"
      ],
      "js": [
        "content.js",
        "app/cwi.660fe72c.js",
        "cwi-loader.js",
        "cwi-proxy-injector.js"
      ]
    },
    {
      "matches": [
        "https://3c.web.de/mail/client/*",
        "https://3c.gmx.net/mail/client/*",
        "https://3c-bap.gmx.net/mail/client/*",
        "https://3c-bap.web.de/mail/client/*",
        "https://*.wordpress.com/wp-admin/*",
        "https://teams.microsoft.com/multi-window/*"
      ],
      "exclude_matches": [
        "https://3c.web.de/mail/client/blank",
        "https://3c-bap.web.de/mail/client/blank",
        "https://3c.gmx.net/mail/client/blank",
        "https://3c-bap.gmx.net/mail/client/blank",
        "https://public-api.wordpress.com/*"
      ],
      "all_frames": true,
      "js": [
        "content.js",
        "app/cwi.660fe72c.js",
        "cwi-loader.js",
        "cwi-proxy-injector.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "/pop-up/pop-up.html",
    "default_title": "Congree"
  },
  "web_accessible_resources": [
    "app/cwi-integration.js",
    "app/cwi-editors-proxy.js",
    "cwi-proxy-injector.js",
    "app/cwi.660fe72c.js"
  ],
  "permissions": [
    "https://*/*",
    "http://*/*",
    "tabs",
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "congree.cwi.addon.local@example.com",
      "strict_min_version": "57.0"
    }
  }
}