Miigen Support
  1. Open Firefox. Tap the Firefox app icon, which resembles an orange fox wrapped around a blue globe.
  2. Tap . It is at the bottom of the screen. A pop-up menu will appear at the bottom of the screen.
  3. Tap Settings. This is the gear-shaped icon in the pop-up menu. If you do not see Settings, swipe from right to left across the pop-up menu.
  4. Tap the orange "Block Pop-up Windows" switch

     

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    It will turn white

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    Doing so will allow pop-ups in your Firefox browser app.