This article explains how to prevent the Mozilla Firefox browser from taking up too much memory and hindering browser and system performance. Learn about the Mozilla Firefox web browser on Windows, macOS, and Linux computers.

First, take simple, common-sense steps to be mindful of Firefox's resources. For example, close tabs you don't want open and update your graphics drivers if you're using Firefox on a Windows PC.

Firefox's built-in Task Manager lets you see which tabs or extensions are using a lot of memory or energy. This is a great way to monitor how much memory the browser is using.

Make sure you are using the latest version of Firefox and close other applications that use a lot of resources when using the browser.