Unload tabs to reduce system memory usage in Firefox

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In Firefox 140, you can unload tabs that you are not actively using. This helps reduce memory and CPU usage while keeping your tabs available to revisit later.

unloadtabsmozilla

When you unload a tab, it stays visible but doesn’t take up resources in the background. When you're ready to return to it, Firefox will reload the page automatically.

Unload a single tab

You can unload a single tab. Doing this lets you prioritize particular tabs without removing them from Firefox.

To do this:

  1. Right-click on the tab
  2. Select Unload Tab

unloadsingletab
This will cause the tab’s icon to gray out, indicating it’s unloaded. When you click the tab again, Firefox will automatically reload the page.

Unload multiple tabs

You can also unload multiple tabs at once if you want to perform wider tab management.

  1. Select the tabs you want to unload (Ctrl + Click on Windows and Linux, Command + Click on Mac)
  2. Right-click one of these tabs and select Unload Tabs

unloadtabs

Tip: If you often keep many tabs open, unloading unused ones can greatly improve performance.

Related articles

Restore previous session - Configure when Firefox shows your most recent tabs and windows
Use tabs to organize lots of websites in a single window
Firefox uses too much memory or CPU resources - How to fix
Tab context menu

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