I have Firefox on an old MacBook which hasn't had its macOS updated for a couple of years, and a new Mac running up-to-date Monterey. In both, Firefox has just developed the same problems at the same time: pages won't load, and the program won't shut down normally -- I have to use force quit. Safari works fine and I've tried all the usual solutions, bar deleting and reloading the app. I don't want to do that yet since the problem is the same on two different computers and an old and a new macOS. Since Firefox has recently updated, has that caused the problem? edited iOS to macOS as iOS is a mobile OS for iPhones and moved thread to (desktop) Firefox section.