Firefox - Disable toolbar animation when switching to full screen mode

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These settings can be accessed as follows:

Open Firefox.
  • In the address bar type the following command:
    • about:config
  • Click on the "I'll be careful, I promise..." button
  • In the Filter field type:
    • browser.fullscreen.animateUp
  • Double-click on this entry and set its value to 0
  • Click on OK to validate
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