I cannot get Options to accept change to 'use custom settings in history', it only accepts other 2 choices.
I can't log in to sites that require cookies saved. I followed instructions to set tools: options to use custom history option. If I hit 'okay', it doesn't keep it set to this choice. If I set it to 'Remember history' or 'Never remember history', it keeps those choices. I started in Safe Mode with add-ons disabled and nothing changed. Please help, I don't want to use Internet Explorer.
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Firefox shows the "(Never) Remember history" setting if all the history and cookie setting are the default.
Make at least one change to the default setting if you want "Use custom settings for history" to stay selected.
Otherwise Firefox will revert to "(Never) Remember history" if you return to the Privacy tab.
The choice "Use custom settings for history" will stay selected as long as not all settings are the default to make you aware that you made changes.
You enter Private Browsing mode if you select: Tools > Options > Privacy > History: Firefox will: "Never Remember History"
In Private Browsing mode some menu items are disabled (grayed) and features like visited links are disabled and not showing.
Also all cookies are session cookies and removed if you end that Private Browsing session or close Firefox.
See also Cookies - Information that websites store on your computer and Enhanced Tracking Protection in Firefox for desktop