Yes. Because they are temporary internet files.
Download and use the excellent free program of crap cleaner.
Run the cleaner after every internet usage to clear temporary files. Untick the cookie option if you ant to save passwords on sites.
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Synology invite you to their launch event on 16th September 2015. See the unveiling of the new DSM and products live, plus a chance to win a populated NAS! Tickets are free and available now. Click HERE for more details