Go to about:memory then click the "Minimize memory usage" button.
P.S. If anyone knows how to add that button to the FF toolbar, I would consider you a minor deity for at least a whole day.
P.S. If anyone knows how to add that button to the FF toolbar, I would consider you a minor deity for at least a whole day.
Send three "heap-minimize" notifications in a row. Each notification triggers a global garbage collection followed by a cycle collection, and causes the process to reduce memory usage in other ways, e.g. by flushing various caches.