Firefox prevented this site from opening a pop-up window


Matthew Adams
by Matthew Adams
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Firefox prevented site from opening pop-up window

Pop-ups are small windows that open from a browser when you open a website page. Pop-up windows are often ads that pop out on website pages. As such, some browsers include built-in pop-up blockers that stamp out pop-up ads. The Firefox browser includes a built-in pop-up blocker that provides a notification stating, “Firefox prevented this site from opening a pop-up window.

However, pop-up windows can also be a more essential addition to some websites. For example, banking sites utilize pop-up windows to provide further transaction details. So, sometimes you might need pop-up windows to open. This is how you can disable Firefox’s pop-up notification so that pop-ups still open.

Firefox prevent sites from opening new windows [FIX]

  1. Enable Pop-up Windows in Firefox
  2. Add Websites to the Exceptions List
  3. Switch off Pop-up Blocker Extensions
  4. Turn Off Third-Party Toolbar Pop-up Blockers

1. Enable Pop-up Windows in Firefox

Firefox includes a Block pop-up option that’s selected by default. You can deselect that setting to turn off the Firefox pop-up notification bar. This is how you can configure that option in Firefox.

  • Click the Open menu button to expand Firefox’s primary menu.
  • Select Options to open the tab shown directly below.

  • Click Privacy on the left of the tab, and then scroll down to the Block pop-up option shown directly below.

  • Now deselect the Block pop-up setting.

2. Add Websites to the Exceptions List

Deselecting that option will fully turn off Firefox’s pop-up blocker. Alternatively, you can keep the a pop-up blocker on but add some sites you need pop-ups for to an exceptions list. To do that, press the Block pop-up setting’s Exceptions button to open the window shown directly below.

There enter a website URL in the text box and press Allow to add it to the exceptions list. Then press the Save Changes button to save the exceptions list. To erase a site from the exceptions list, select it and press the Remove Website button.

— RELATED: ‘Check your virus protection’ pop up on Windows 10: How to remove it

3. Switch off Pop-up Blocker Extensions

Deselecting the Block pop-up does not always ensure that the pop-up windows open. Third-party pop-up blocker extensions can still block pop-ups in Firefox. Thus, you might still need to switch off some Firefox extensions to enable pop-up windows. You can switch off Firefox extensions as follows.

  • Press the Open menu button at the top right of the browser.
  • Click Add-ons to open the tab shown directly below.

  • Click Extensions on the left of the tab to open an add-on list.

  • Then you can press the Disable buttons for extension to switch them off.

4. Turn Off Third-Party Toolbar Pop-up Blockers

Third-party Firefox toolbars also block pop-up windows. The Google, AOL and Yahoo browser toolbars are three that include pop-up blockers. You don’t usually need to remove those toolbars to enable website pop-up windows. The toolbars usually include a pop-up button that you can press to turn their pop-up blockers on or off.

When you’ve turned off the pop-up blockers, a few pop-up ad windows will also probably open from Firefox. So it’s probably better to add sites you need to retain pop-ups on to the exceptions list instead of switching the browser’s pop-up blocker off.

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