Pop-up blocker settings, exceptions and troubleshooting

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What are pop-ups?

Pop-up windows, or pop-ups, are windows that appear automatically without your permission. They vary in size, but usually don't cover the whole screen. Some pop-ups open on top of the current Firefox window, while others appear underneath Firefox (pop-unders).

Firefox allows you to control both pop-ups and pop-unders in Firefox OptionsPreferencesSettings . Pop-up blocking is turned on by default, so you don't have to worry about enabling it to prevent pop-ups from appearing in Firefox.

When blocking a pop-up, Firefox displays an information bar (if it hasn’t been previously dismissed – see below), as well as an icon popup_icon_fx57 in the address bar.

PopupFx89Fx90Popup-mac

When you click either the OptionsPreferences button in the info bar or the icon in the address bar, a menu is displayed with the following choices:

  • Allow/Block pop-ups for <website address>
  • Manage pop-up settings…
  • Don't show this message when pop-ups are blocked
  • Show <pop-up web address>
Blocking pop-ups may interfere with some websites: Some websites, including some banking sites, use pop-ups for important features. Blocking all pop-ups disables such features. To allow specific websites to use pop-ups, while still blocking all others, you can add those specific websites to the list of allowed sites. Blocking pop-ups doesn't always work: Although Firefox blocks most pop-ups, some websites may show pop-ups using uncovered methods, even when they are blocked.

Pop-up blocker settings

To access the pop-up blocker settings:

  1. In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button Fx89menuButton and select Settings.
  2. Select the Privacy & Security panel.
  3. Go down to the Permissions section.
    • Uncheck the box next to Block pop-up windows to disable the pop-up blocker altogether.
    • Click the Exceptions… button to the right of Block pop-up windows to open a dialog box to choose which sites are allowed to display pop-ups.
    Allowed Websites Pop-ups

The dialog box offers you the following choices:

  • Type or paste the address of a website and click the Allow button to add it to the list of sites that will be allowed to open pop-up windows.
  • Select a website from the list and click the Remove Website button to remove it from the exceptions list.
  • Click the Remove All Websites button to remove all websites from the exceptions list.

Click the Save Changes button to apply your changes.

Pop-ups not being blocked

Is the pop-up coming from Firefox?

The pop-up may not actually be coming from Firefox. You can determine where the pop-up is coming from by the appearance of the window.

  • If you see the address bar with the Tracking Protection button Fx89ShieldIcon and the Site Identity button Fx89Padlock in the pop-up window, the pop-up is coming from Firefox.
  • If you don't see these buttons, you may have malware on your computer that causes the pop-ups. For help, see Troubleshoot Firefox issues caused by malware.

Is the pop-up blocker on and enabled for this site?

  1. In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button Fx89menuButton and select Settings.
  2. Select the Privacy & Security panel and go to the Permissions section.
  3. Make sure the Block pop-up windows checkbox is checked.
  4. To the right of Block pop-up windows, click the Exceptions… button. A dialog box will open with a list of sites that are allowed to show pop-ups.
  5. If the site that's opening pop-ups is listed here, select it and click Remove Website.
  6. Click on Save Changes to update your changes.
  7. Close the about:preferences page. Any changes you've made will automatically be saved.

Is the pop-up shown after a mouse click or a key press?

Certain events, such as clicking or pressing a key, can spawn pop-ups regardless of if the pop-up blocker is on. This is intentional, so that Firefox doesn't block pop-ups that websites need to work.

Is it a true pop-up window?

Sometimes ads are designed to look like windows, but really aren't. Firefox's pop-up blocker can't stop these ads.

Mozilla surveys

When you visit a Mozilla website, sometimes you'll see a pop-up asking you to participate in a survey. The only third-party that Mozilla ever uses for surveys is Alchemer (formerly SurveyGizmo), which has been vetted by our legal and privacy teams. The Firefox pop-up blocker doesn't block these pop-ups.

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