In Firefox almost any search box can be right clicked and there is an option "Add a keyword for this search". If you use "y" shortcut for youtube, then your URL

In Firefox almost any search box can be right clicked and there is an option "Add a keyword for this search". If you use "y" shortcut for youtube, then your URL entry is "y gangnam". Also if you use DDG as your main URL search engine, they have bunch of "bang" shortcuts that redirect your query to online searches. For yt you'd use "!you gangnam". Others can be found here: https://duckduckgo.com/bang https://duckduckgo.com/bang