The only reason I use Brave is that I can type “you” + tab to directly enter YouTube search from the URL input field, and this works for gMaps and Amazon. For the life of me I cannot figure out how to configure this in Firefox.
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
Edit: !m or !gmap for Google Maps, !a for Amazon
1. Add YouTube as a search engine (visit YouTube, click on the + in the search box and click 'Add "YouTube"').
2. Open Firefox Settings > Search > Search Shortcuts (near the bottom)
3. Set a keyword "you" for YouTube in the table
4. Search by typing "you" + Tab in the address bar