The extension integrates with the find/goto box using the alias
given in the options page. This is done by prefixing the search terms with
>se or whatever alias you have choosen.
It should be noted that this alias is registered as the extension is
loaded into Atmel Studio. This is done whenever the user interacts with the
window or the context menu. To make a search in the find/goto box and
force the extension to load at the same time, use the full name
>Tools.HelpSearch instead of the alias.