If you are seeing high memory consumption by Firefox, put about:memory in the address bar of a tab and try the "Reduce memory usage" option, which triggers a global garbage collection followed by a cycle collection, and can reduce memory usage in other ways, e.g., by flushing various caches. If that doesn't sufficiently reduce memory, try the "Measure" option to view memory usage by Firefox, which will allow you to see usage information associated with URLs that can allow you to determine which tab or tabs you could close to significantly reduce Firefox's memory usage.
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