Examine source code of Super Session Manager

{
  "manifest_version": 3,
  "name": "Super Session Manager",
  "short_name": "Super Session Manager",
  "description": "Session Manager helps you save, organize and restore tab sessions, tab groups & bookmarks. Privacy-focused Tab Manager.",
  "default_locale": "en",
  "version": "6.1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "super-session-manager@sessionmanager.net",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "websiteContent",
          "authenticationInfo",
          "personallyIdentifyingInfo"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "action": {
    "default_title": "Super Session Manager - Tab Manager & Bookmark Manager",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "img/16.png",
      "48": "img/48.png",
      "128": "img/128.png"
    }
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "type": "module"
  },
  "options_page": "options.html",
  "content_scripts": [
    {
      "matches": [
        "https://sessionmanager.net/*",
        "https://*.sessionmanager.net/*"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "permissions": [
    "alarms",
    "storage",
    "tabs",
    "tabGroups"
  ],
  "host_permissions": [
    "https://sessionmanager.net/*",
    "https://*.sessionmanager.net/*"
  ],
  "icons": {
    "16": "img/16.png",
    "48": "img/48.png",
    "128": "img/128.png"
  },
  "author": "Super Session Manager Team",
  "homepage_url": "https://sessionmanager.net",
  "content_security_policy": {
    "extension_pages": "script-src 'self'; upgrade-insecure-requests; connect-src 'self' https://*.supabase.co https://sessionmanager.net https://*.sessionmanager.net https://t1.gstatic.com https://*.gstatic.com; img-src 'self' data: https:;"
  },
  "omnibox": {
    "keyword": "session"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+S",
        "mac": "Command+Shift+S"
      }
    },
    "save-current-window-session": {
      "description": "Save current window as a session"
    }
  }
}