https://support.mozilla.org/en-US/kb/tab-preferences-and-settings?redirectslug=closing-multiple-tabs-option-disable-warning&redirectlocale=en-US
Tab preferences and settings | Firefox Help
Learn how to customize tab settings in Firefox to enhance your browsing experience.
preferences and settingstabfirefoxhelp
https://www.chachaslab.com/chasysphoto/help.php?file=preferences_editor.htm
Preferences and Settings - Chasys Photo Editor
preferences and settingsphotoeditor