Social media addiction is a real thing - if you want to quit Facebook but don't want to deal with the hassle of installing browser extensions or deleting your account (Facebook deliberately makes this complicated), just log out from all your browsers and delete any installed apps.

If you depend on Facebook for managing a page (work, band, etc), just use the dedicated Pages application. Same applies for Messenger if you don't want to get rid of it.

It's helped me curb the ridiculous "CTRL+T, fa, enter" reflex - seeing the login page instead of my Facebook feed every time I do this makes me notice how out of hand this has gotten for me.