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I changed my browser url to blank now I cannot find bookmarks or menu toolbar, pls can someone tell me how to restore to original url setting?

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I tried to remove thumbnails from Firefox & following online advice went to browser.newtab.url and changed it to "blank", now when I open Firefox the menu bar with bookmarks etc is missing, but when I open a new tab the thumbnail images are still there, I don't have much experience & would appreciate advice as to how to restore. I tried restoring computer to earlier time but that didn't not restore the browser url to the state before I started messing with it. Please help!

I tried to remove thumbnails from Firefox & following online advice went to browser.newtab.url and changed it to "blank", now when I open Firefox the menu bar with bookmarks etc is missing, but when I open a new tab the thumbnail images are still there, I don't have much experience & would appreciate advice as to how to restore. I tried restoring computer to earlier time but that didn't not restore the browser url to the state before I started messing with it. Please help!

Chosen solution

Make sure that you do not run Firefox in full screen mode (press F11 or Fn + F11 to toggle; Mac: Command+Shift+F).

If you are in full screen mode then hover the mouse to the top of the screen to make the Navigation Toolbar and Tab bar appear.
Click the Maximize button (top right corner of the Navigation Toolbar) to leave full screen mode or right-click empty space on a toolbar and choose "Exit Full Screen Mode" or press the F11 key.

You can use one of these to set which toolbars to show.

  • "3-bar" Firefox menu button > Customize > Show/Hide Toolbars
  • View > Toolbars
    Tap the Alt key or press F10 to show the Menu Bar
  • Right-click empty toolbar area

What is the current value of the browser.newtab.url pref?

If you do not keep changes after a restart or otherwise have problems with preferences, see:


You can create a new Boolean pref on the about:config page to prevent Firefox from generating thumbnails for the about:newtab page.

  • name: browser.pagethumbnails.capturing_disabled with value: true

Delete the thumbnails folder in the Firefox profile folder to remove already stored web page thumbnails.

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Chosen Solution

Make sure that you do not run Firefox in full screen mode (press F11 or Fn + F11 to toggle; Mac: Command+Shift+F).

If you are in full screen mode then hover the mouse to the top of the screen to make the Navigation Toolbar and Tab bar appear.
Click the Maximize button (top right corner of the Navigation Toolbar) to leave full screen mode or right-click empty space on a toolbar and choose "Exit Full Screen Mode" or press the F11 key.

You can use one of these to set which toolbars to show.

  • "3-bar" Firefox menu button > Customize > Show/Hide Toolbars
  • View > Toolbars
    Tap the Alt key or press F10 to show the Menu Bar
  • Right-click empty toolbar area

What is the current value of the browser.newtab.url pref?

If you do not keep changes after a restart or otherwise have problems with preferences, see:


You can create a new Boolean pref on the about:config page to prevent Firefox from generating thumbnails for the about:newtab page.

  • name: browser.pagethumbnails.capturing_disabled with value: true

Delete the thumbnails folder in the Firefox profile folder to remove already stored web page thumbnails.

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Thank you your "very clear "how to"description, not only has it resolved the issues, I have also learned a few things I didn't know before. Cheers.

Modified by Frustratedtoo