Examine source code of TheSpammer

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "2.2.1",
  "short_name": "__MSG_appShortName__",
  "homepage_url": "https://github.com/gabry2003/TheSpammer",
  "manifest_version": 2,
  "default_locale": "it",
  "icons": {
    "16": "images/icon.png",
    "32": "images/icon.png",
    "48": "images/icon.png",
    "128": "images/icon.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "pages/options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon.png",
      "38": "images/icon.png"
    },
    "default_title": "__MSG_browserActionTitle__",
    "default_popup": "pages/popup.html"
  },
  "offline_enabled": false,
  "content_security_policy": "script-src 'self' 'unsafe-eval' https://ajax.googleapis.com https://cdn.jsdelivr.net https://code.jquery.com https://cdn.jsdelivr.net https://stackpath.bootstrapcdn.com https://cdnjs.cloudflare.com; object-src 'self'",
  "content_scripts": [
    {
      "matches": [
        "*://web.whatsapp.com/*",
        "*://web.telegram.org/*",
        "*://meet.google.com/*",
        "*://*.messenger.com/*",
        "*://*.instagram.com/*",
        "*://*.tellonym.me/*",
        "*://teams.microsoft.com/*",
        "*://*.zoom.us/*"
      ],
      "css": [
        "styles/sweetalert2.min.css",
        "styles/bootstrap.min.css",
        "styles/tabStyle.css"
      ],
      "js": [
        "scripts/jquery-3.5.1.min.js",
        "scripts/promise-polyfill.js",
        "scripts/sweetalert2.all.min.js",
        "scripts/theSpammer.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "cookies",
    "privacy",
    "sessions",
    "storage",
    "unlimitedStorage",
    "tabs",
    "*://web.whatsapp.com/*",
    "*://web.telegram.org/*",
    "*://meet.google.com/*",
    "*://*.instagram.com/*",
    "*://*.messenger.com/*",
    "*://*.tellonym.me/*",
    "*://teams.microsoft.com/*",
    "*://*.zoom.us/*",
    "*://cdn.jsdelivr.net/*",
    "*://code.jquery.com/*",
    "*://stackpath.bootstrapcdn.com/*",
    "*://cdnjs.cloudflare.com/*"
  ]
}