Why is the "Clear Recent History" under my "History" menu inactive (grayed out, not black)?

When I click on the "History" icon, I get a new window with "History" at the top. Under it are three sub-options: "view History Sidebar", "Clear Recent History" (which is the one that I want to access), and "Restore Previous Session". Only the first one is black/active/"hot"; the other two are gray and do nothing when either clicked or the designated keyboard alternative is used. what must I do to be able to clear my history.

Did you make sure that Firefox isn't already running in private browsing mode?
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can also check the target line in the Firefox desktop shortcut.
You can use an extension to get Private Browsing mode support per tab to see if that shows that you are in a Private Browsing mode tab.
*Private Tab: https://addons.mozilla.org/firefox/addon/private-tab/
*Private Browsing mode tabs get a dashed underline
*You can toggle Private Browsing mode on/off on each tab via the right-click context menu of the tab
Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
*Download the full Firefox installer and save the file to the desktop<br>https://www.mozilla.org/en-US/firefox/all/
If possible uninstall your current Firefox version to cleanup the Windows registry and settings in security software.
*Do NOT remove "personal data" when you uninstall your current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*(32 bit Windows) "C:\Program Files\Mozilla Firefox\"
*(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.
If you keep having problems then also create a new profile.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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