How to manually change web-address autofill?

I regularily go to "https://www.desmos.com/calculator", however when I type in "des..." to firefox it autocompletes to "https://www.desmos.com" which I don't want, and then need to do a few extra clicks to get the "/calculator". Is there any way to manually change what will show up? I never want to go to "https://www.desmos.com", and only want "https://www.desmos.com/calculator". I have similar issues around websites I use incredibly rarely, strangely coming up as top suggestions for autocomplete.