It looks like the Yelp website is no longer compatible with your Firefox 78.15.0 version. If I use the current release then drop down menus open if I hover items like Homeservices. In Firefox 78 those menus do not open and not all resulting pages work (Restaurants work partly). *https://www.yelp.com/search?find_loc=San+Francisco%2C+CA So if looks that you are out of luck with your Firefox 78 version that is the last version for your OS. Current Firefox releases require Mac OS X 10.12 or newer. *https://support.mozilla.org/en-US/kb/firefox-mac-osx-users-esr