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Learn how to free up system memory by unloading inactive tabs in Firefox.

Tab Unloading is a new functionality that helps reduce memory usage by unloading tabs that you are not actively using. To avoid crashes, Firefox will automatically select and unload these open tabs when the system's memory is low, starting in [[Find what version of Firefox you are using|Firefox version]] 93 on Windows. <!--(Automatic tab unloading will be available for macOS in Firefox version 95 and in a future Firefox version for Linux).-->This is a smart process that avoids unloading tabs that are playing media, using Picture-in-Picture, or WebRTC. For more technical information, see [https://hacks.mozilla.org/2021/10/tab-unloading-in-firefox-93/ this blog post]. The ''about:unloads'' page, built into Firefox 94 for all Desktop platforms, will show you information about the order of priority of your open tabs, the memory each tab is consuming, and the last time you accessed each tab. To access this configuration, type ''about:unloads'' in the address bar and press {key Enter}. [[Image:Fx94TabUnloading-Win]] You can manually unload your least-recently-used tabs by going to the ''about:unloads'' page and clicking on the {button Unload} button that appears above the table, on the right. {note}'''Note:''' This feature is enabled by default. If you are an advanced user and you want to disable Tab Unloading, you can do so by setting the preference {pref browser.tabs.unloadOnLowMemory} to {pref false} in the [[Configuration Editor for Firefox|Firefox Configuration Editor]] (about:config page).{/note}