Lower firefox memory usage

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Is there a way from javascript to make firefox free the memory, for example when upload finish or after images are loaded or closed? The problem is that even after upload finish or after closing the images pages the memory is not getting free, firefox still have 2gb of ram memory.

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It happens expecially when I upload big files (100mb-400mb) with ajax uploader, and also happens when I open to many images (for example 16mb of total images on a web page). I notice that after using firefox for a couple of hours it gets more that 2gb of ram memory.