Shift + Ctrl + T doesn't work anymore. I tried uninstalling and reinstalling and it still don't work. I can't find the other answers.

Today, I noticed that open a closed tab previously not working anymore. This feature is crucial for my work. I tried to uninstall Firefox and reinstall and it did not help. Under history, recently closed recently closed tabs, windows and are grey. I have my story to remember settings.

I don't know what the problem is and I need to my Shift + Ctrl + T return.

Your list of details of the system shows that you have defined two preferences that control the restoration of closed tabs and windows are set to 0:

  • Browser.sessionstore.max_tabs_undo: 0
  • Browser.sessionstore.max_windows_undo: 0

You can reset all browser.sessionstore. * prefs that appear "BOLD" (user set) to the default via the context menu.

You can check if you have a user.js file in the Firefox profile folder that sets the prefs as pref browser.sessionstore.resume_session_once true.

Note that your list of details of the system shows that you have a user.js file in the profile folder to initialize some preferences at each start of Firefox.

The user.js file appears only if you or another software created, therefore, normally, he wouldn't be here.
You can check its contents with a text editor if you do not create this file yourself.

The user.js file is read whenever you launch Firefox and initializes the preferences to the value specified in this file, so set of preferences via user.js can be changed temporarily for the current session.

Tags: Firefox

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