It seems like a good extension; it's just a bit tricky to figure out the right URL/command to open the desired page. It took me a little while to get it to recognize the Amazon, but for anyone interested, here is the URL/command https:// www.amazon.com.mx/s?k={text} (delete de blank space between // and www)

Just change the domain to match your country; since I'm from Mexico, I used .com.mx.

BTW, how do you add icons where the name goes? I'd like to add the YouTube or Amazon icons.