Do you see the search engines in Options/Preferences? *Options/Preferences -> Search

''bobbee25 [[#question-1181756|said]]'' <blockquote> now search engines not displayed, sometimes in tools options </blockquote> Are you saying that one moment they are there, and next moment they're gone ? That's weird. Let's try Firefox in Safe Mode : If Firefox is not running : Hold down the Shift key when starting Firefox. If Firefox is running : 3-bar menu => ' ? ' (at the bottom of the dropdown) => 'Restart with Add-ons disabled'. Then OK the restart. A small dialog should appear. Click 'Start in Safe Mode' ( not 'Refresh' !) See : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode And also : https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems Any difference ?