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"Tab Unloading in Firefox 93"
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. This feature is currently enabled on Windows and will be deployed later for macOS and Linux as well.
https://hacks.mozilla.org/2021/10/tab-unloading-in-firefox-93/