Examine source code of Web for Google Messages

{
  "manifest_version": 2,
  "name": "__MSG_chrome_extension_name__",
  "description": "__MSG_chrome_extension_description__",
  "version": "6.0",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "oinkandstuffandroidmessages@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"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://messages.android.com/*",
        "*://messages.google.com/*",
        "*://meet.google.com/*",
        "*://mail.google.com/chat/*",
        "*://chat.google.com/*",
        "*://gsuite.google.com/*",
        "*://workspace.google.com/*",
        "*://apps.google.com/*"
      ],
      "js": [
        "js/jquery/jquery.min.js",
        "js/safeResponse/purify.min.js",
        "js/toastr/toastr.min.js",
        "i18n.js",
        "js/i18n/i18n.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"
      ],
      "run_at": "document_start",
      "all_frames": false
    },
    {
      "matches": [
        "*://messages.google.com/*"
      ],
      "js": [
        "myScriptChatBadge.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    "img/*",
    "js/*",
    "onInstalled/*",
    "options/*",
    "css/*",
    "html/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'"
}