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The Marvellous Suspender vs Auto Tab Discard
Auto Tab Discard is open source under MPL-2.0 and also suspends inactive tabs to free memory, with exclusions for pinned, playing and form-filled tabs.- The Marvellous Suspender vs Tab Wrangler
Tab Wrangler closes idle tabs automatically and keeps them in a list for restoring instead of suspending them, and it is available for both Chrome and Firefox.