Examine source code of Chat Multi Messenger

{
  "manifest_version": 2,
  "name": "__MSG_chrome_extension_name__",
  "description": "__MSG_chrome_extension_description__",
  "version": "5.2",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "oinkandstuffchatmultimessenger@gmail.com"
    }
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_title": "__MSG_chrome_extension_name__",
    "default_icon": {
      "19": "img/icon_19.png",
      "38": "img/icon_38.png"
    }
  },
  "background": {
    "scripts": [
      "eventPage.js"
    ]
  },
  "icons": {
    "16": "img/icon_16.png",
    "48": "img/icon_48.png",
    "128": "img/icon_128.png"
  },
  "permissions": [
    "notifications",
    "<all_urls>",
    "contextMenus",
    "unlimitedStorage",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "webNavigation"
  ],
  "content_scripts": [
    {
      "run_at": "document_start",
      "js": [
        "myScriptTelegramBadge.js"
      ],
      "matches": [
        "*://web.telegram.org/*"
      ],
      "all_frames": true
    },
    {
      "js": [
        "myScriptWhatsappBadge.js"
      ],
      "matches": [
        "*://web.whatsapp.com/*"
      ],
      "all_frames": true
    },
    {
      "js": [
        "myScriptSkypeBadge.js"
      ],
      "matches": [
        "*://web.skype.com/*"
      ],
      "all_frames": true
    },
    {
      "js": [
        "myScriptHangoutsBadge.js"
      ],
      "matches": [
        "*://hangouts.google.com/*"
      ],
      "all_frames": true
    },
    {
      "js": [
        "myScriptLinkedinBadge.js"
      ],
      "matches": [
        "*://*.linkedin.com/*"
      ],
      "all_frames": true
    },
    {
      "js": [
        "myScriptTwitterBadge.js"
      ],
      "matches": [
        "*://*.twitter.com/*"
      ],
      "all_frames": true
    },
    {
      "run_at": "document_start",
      "js": [
        "setnavigator.js",
        "ua.js",
        "myScriptInstagramBadge.js"
      ],
      "matches": [
        "*://*.instagram.com/*"
      ],
      "all_frames": true
    },
    {
      "run_at": "document_start",
      "js": [
        "setnavigator.js",
        "ua.js"
      ],
      "matches": [
        "*://*.tiktok.com/*"
      ],
      "all_frames": true
    },
    {
      "js": [
        "js/jquery/jquery.min.js",
        "js/safeResponse/safeResponse.js",
        "js/toastr/toastr.min.js",
        "i18n.js",
        "js/i18n/i18n.js",
        "js/file-saver/FileSaver.min.js",
        "js/introjs/intro.min.js",
        "js/material-io/material-components-web.min.js",
        "js/jquery-menu/jquery.contextMenu.min.js",
        "js/jquery-menu/jquery.ui.position.min.js",
        "utils.js",
        "myScript.js"
      ],
      "matches": [
        "*://*.reefcentral.pt/multi-messenger/*"
      ],
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "img/*",
    "js/*",
    "onInstalled/*",
    "options/*",
    "css/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'"
}