Examine source code of OneTab

{
  "manifest_version": 3,
  "name": "OneTab",
  "description": "__MSG_manifestDescription__",
  "version": "2.18",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@one-tab.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "commands": {
    "display-onetab": {
      "suggested_key": {
        "default": "Alt+Shift+1"
      },
      "description": "__MSG_openOneTab__"
    },
    "send-current-tab-to-onetab": {
      "description": "__MSG_sendCurrentTabToOneTab__"
    },
    "send-all-tabs-in-current-window-to-onetab": {
      "description": "__MSG_sendAllTabsInWindowToOneTab__"
    },
    "send-all-tabs-in-current-tab-group-to-onetab": {
      "description": "__MSG_sendAllTabsInGroupToOneTab__"
    },
    "send-all-tabs-except-this-to-onetab": {
      "description": "__MSG_sendAllTabsExceptThisToOneTab__"
    },
    "send-left-tabs-to-onetab": {
      "description": "__MSG_sendLeftTabsToOneTab__"
    },
    "send-right-tabs-to-onetab": {
      "description": "__MSG_sendRightTabsToOneTab__"
    },
    "send-all-tabs-in-all-windows-to-onetab": {
      "description": "__MSG_sendAllTabsAllWindowsToOneTab__"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "images/extension-icon16.png",
    "32": "images/extension-icon32.png",
    "48": "images/extension-icon48.png",
    "64": "images/extension-icon64.png",
    "128": "images/extension-icon128.png"
  },
  "optional_permissions": [
    "tabGroups",
    "bookmarks"
  ],
  "permissions": [
    "unlimitedStorage",
    "storage",
    "tabs",
    "scripting",
    "contextMenus"
  ],
  "optional_host_permissions": [
    "https://www.one-tab.com/*"
  ],
  "action": {
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    },
    "default_popup": "popup.html"
  },
  "omnibox": {
    "keyword": "11"
  },
  "background": {
    "scripts": [
      "ext-onetab-concatenated-sources-background.js"
    ],
    "type": "module"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; img-src 'self' data: https://t2.gstatic.com;"
  }
}