https://support.mozilla.org/en-US/questions/1273459
Try to set accessibility.typeaheadfind.manual and possibly all other accessibility.typeaheadfind prefs to false on the about:config page.
accessibility.typeaheadfind.manual = false
accessibility.typeaheadfind = false
accessibility.typeaheadfind.autostart = false
You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.
Try to set accessibility.typeaheadfind.manual and possibly all other accessibility.typeaheadfind prefs to false on the about:config page.
accessibility.typeaheadfind.manual = false
accessibility.typeaheadfind = false
accessibility.typeaheadfind.autostart = false
You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.