Hi, please see under Provide search suggestions in Change your default search settings in Firefox

And Location Bar in the Options > Privacy tab - Settings for privacy, browsing history and do-not-track

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Change your default search settings in Firefox ,

I see that, and tried.

went ' privacy'

click location bar.

it hide nothing.

I do not want to delete all search history.

I only want to hide it in an appropriate timing.

this doesnt resolve my problem.

Hi

Have you tried using Private Browsing? You can read more about it here.

Private Browsing has not much to do with the problem I post...

You need to disable the search history.

To see all History and Cookie settings, choose:

• Options/Preferences -> Privacy -> Firefox will: "Use custom settings for history"

Remove the tick on remember search and form history

• https://support.mozilla.org/kb/Options+window+-+Privacy+panel