Click in the field and enter a character or two and STOP ! Using the arrow keys, highlight an unwanted entry. Then press Delete (Mac=Shift Delete). Repeat as needed.

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

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.

FredMcD said

Click in the field and enter a character or two and STOP ! Using the arrow keys, highlight an unwanted entry. Then press Delete (Mac=Shift Delete). Repeat as needed.

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Thanks but, as stated above, this no longer works.

Have you checked out the second part of that message?

Actually, that's what I ended up doing but that meant deleting everything when I only wanted to delete one thing. That's not really a solution though. It's like burning your house down and rebuilding because you painted one wall the wrong color.

Perhaps the problem was fixed. Let us know.