We believe this may especially benefit people who are doing heavy browsing work with many tabs on resource-constrained machines. Unloading tabs allows Firefox to save memory leading to fewer crashes and avoids the associated interruption in using the browser. On Windows, out-of-memory (OOM) situations are responsible for a significant number of the browser and content process crashes reported by our users. The tab’s scroll position and form data are restored just like when the browser is restarted with the restore previous windows browser option. When a tab is unloaded, the tab remains in the tab bar and will be automatically reloaded when it is next selected. This feature is currently enabled on Windows and will be deployed later for macOS and Linux as well.
Starting with Firefox 93, Firefox will monitor available system memory and, should it ever become so critically low that a crash is imminent, Firefox will respond by unloading memory-heavy but not actively used tabs.
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