We do not recommend using other programs to clean Firefox because they could corrupt the files. Also, the browser can clean itself.

You may be in Private Browsing mode or told Firefox not to remember.

Type about:preferences#privacy<enter> in the address bar. The button next to History, select Use Custom Settings.

Turn off Always Use Private Browsing Mode Turn on Remember My Browsing And Download History At the bottom of the page, turn on Clear History When Firefox Closes. At the far right, press the Settings button. Turn on ONLY Cache and Form And Search History leaving the others off.

Macs: Make sure you install Firefox properly and that you do not run Firefox from within the DMG (Disk Images) file. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Fred,

Thank you for the advise. I continued to have the problem and had to continue looking. What I did to solve the problem follows. I cleared the cashe again with a utility app and then checked the details. There were several files that would not clear. They were all within a deep subfolder having to do with MS Outlook. I closed my outlook, then recleared my cashe using the settings option in privacy and security in the firefox browser (as I normally do). Everything was cleared. I have no idea why about 16mb were being used/stored due to msword.

Thank you again for the assist.

That was very good work. Well Done. Please flag your last post as Solved Problem as this can help others with similar problems. Go to that post and click the 'Solved' button to its right.