Firefox uses four content processes at any given time. Meaning that if you have 20 open tabs in Chrome, Chrome will use 20 processes and Firefox will only use four.
UNIQUE EXTENSIONS
Firefox contains some unique extensions that are hard to find on chrome. Like "Multi-Account Containers" this extension allows you to logging into multiple accounts in one website on same browser.
MORE SECURED
Firefox has built-in tracker blocking features to block trackers and scripts such as social media trackers, cross-site tracking cookies, fingerprinting, and crypto miners.
YOU CAN CUSTOMIZE IT THE WAY YOU WANT
Firefox allows you to show creativity and to customize your theme by yourself. Firefox Color (Extension) allows you to create themes.