I also remember missing that feature dearly when I switched from Chrome to Firefox. However, some time in the intervening decade, they've actually added that to Firefox! I can type "<Ctrl-L>ebay<TAB>esp32<ENTER>" and I end up on the eBay search page for "esp32". Perhaps there is a setting or about:config option that needs to be toggled? Many of Firefox's best features are thusly hidden.