Firefox prevented this site from opening a pop-up window

Matthew Adams
by Matthew Adams
Windows & Software Expert
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  • Mozilla Firefox is one of the world's most popular web browsers.
  • The guide below will showcase what to do if it prevents pop-ups from opening.
  • If other browser issues are also bothering you, check out our Browser Errors Hub.
  • To read more about this amazing browser, visit our website's Firefox section.
Firefox prevented site from opening pop-up window
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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.

How do I make Firefox open pop-up ads again?

  1. Consider using a different browser
  2. Enable pop-up Windows in Firefox
  3. Add websites to the Exceptions List
  4. Switch off Pop-up Blocker extensions
  5. Turn off third-party toolbar Pop-up Blockers

1. Consider using a different browser

Before going through all of the solutions mentioned below, you should first consider whether or not it would be easier to just switch to a different browser.

That being said, if you do want to go ahead and do this, might as well use a reliable tool such as Opera.

Unlike Firefox, Opera is Chromium-based, which has proven itself to be far more customizable, faster, and reliable.

This makes Opera not just efficient at its job, but using it is a joy in itself since you can make the browser act as a hub of all the websites, tools, and shortcuts that you may ever need.

As for page loading issues, Opera is very fast, and it is frequently updated, so in the odd case of you ever have issues with it, it will sort itself out in no time at all.



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2. Enable Pop-up Windows 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.

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.

3. 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.

4. Switch off Pop-up Blocker Extensions

  • 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.

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.

5. 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.

The solutions listed above are also useful if you encounter the following errors messages:

  • Firefox prevented this site from opening a pop-up window 68.01 – This issue is mostly encountered by those using Mozilla Firefox v.68.01
  • Firefox preventing from opening pop-up windows can’t open anything else – This happen when Firefox has difficulties opening up pretty much any kind of content.

Editor’s Note: This post was originally published in April 2018 and has been since revamped and updated in July 2020 for freshness, accuracy, and comprehensiveness.

Editor's Note: This article was originally published in April 2018 and was revamped and updated in September 2020 for freshness, accuracy, and comprehensiveness.