Gadget export
From Halopedia, the Halo wiki
To export the TabSystem gadget, click on "Download" button, save the downloaded file, go to Special:Import on destination wiki and upload it. Then add the following to MediaWiki:Gadgets-definition page:
* TabSystem[ResourceLoader|default|hidden|targets=desktop,mobile]|TabSystem.js|TabSystem.css
You must have appropriate permissions on destination wiki (including the right to edit system messages) and import from file uploads must be enabled.