In spite of my settings firefox keeps deleting all the temp data

What do you have installed as far as Security applications or anti-malware applications?

Some of those types of applications have features to clear browser data.

The only application of that type on my pc is malware bytes, and I don't have it run active protection.

History and cookies can be removed or not recorded several ways;

• 1) Running Firefox in Private Mode (nothing is recorded)
• 2) Privacy settings
  (Type about:preferences#privacy<enter> in the address bar.)
• 3) Many disk cleaners and anti-virus type programs can remove data from browsers. Open their settings and have them leave the browsers alone.
• 4) Mal-ware.