If it turns out that the Mac machine is frozen, you’ll probably have to do a hard reboot by pressing the power button – holding it for three seconds, then press it again to restart your Mac. How to Fix a Slow or Freezing Firefox on Mac Step 1: If Firefox becomes totally unresponsive, force quit. Your Macbook is slow in general, making you feel Firefox is the culprit.Your Firefox has lots of caches, browsing histories, downloads.You are using a very old version of Firefox (to be updated).Too many resource-intensive applications are running, leaving Firefox little space to process your requests.
Those plugins are very likely to cause Firefox to freeze.
