Privacy and Security
In Options/Privacy and Security/Clear history when Firefox closes the box is selected but both the box and the accompanying settings are greyed out - I need to change these settings for a particular program to run corrctly.
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Btw this is Firefox 57
Make sure you do not run Firefox in permanent Private Browsing mode (Always use Private Browsing mode; Never Remember History).
- Options/Preferences -> Privacy & Security -> Firefox will: "Use custom settings for history"
- remove checkmark: [ ] "Always use Private Browsing mode"