cache does not clear
I am using Firefox for Linux (Ubuntu). I can not clear the cache under the Settings>Privacy and Security>Clear Site Cookies and Data. In fact, over the last year the cache has grown from 120MB to currently 364MB. Each time I go into Settings and clear the cache, I'm still have 364MB. The Firefox software is up-to-date. When I have entered about:cache in the address bar, the cache is residing in memory and not on the disk. Please tell me how I can clear my cache.