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.You have opened many tabs and windows while browsing, especially those heavy pages (full of video ads).Those plugins are very likely to cause Firefox to freeze.
