FIX: Firefox prevented the site from opening a pop-up window

• The Mozilla Firefox prevented this site from opening a pop-up window message due to the pop-up blockers.
• You can easily enable the pop-up windows from your Mozilla browser settings by using the method below.
• If your Mozilla prevents a site from opening a pop-up window, try switching to another browser.
• Adding the problematic website to the exception list by following our solution will also get rid of the message.

• Easy migration: use the Opera assistant to transfer exiting Firefox data, in just a few steps
• Optimize resource usage: your RAM memory is used more efficiently than Firefox does
• Enhanced privacy: free and unlimited VPN integrated
• No ads: built-in Ad Blocker speeds up loading of pages and protects against data-mining
• Download Opera

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. The solutions listed below 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 happens when Firefox has difficulties opening up pretty much any kind of content.

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.

Opera

2. Enable pop-up windows in Firefox

1. Click the Open menu button to expand Firefox’s primary menu.
2. Select Options to open the tab shown directly below.
   
3. Click Privacy on the left of the tab, and then scroll down to the Block pop-up option shown directly below.
   
4. Now deselect the Block pop-up setting.

Run a System Scan to discover potential errors

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

1. To do that, press the Block pop-up setting’s Exceptions button.
2. This will open the window shown directly below.
   
3. There, enter a website URL in the text box.
4. Press Allow to add it to the exceptions list.
5. Then press the Save Changes button to save the exceptions list.
6. To erase a site from the exceptions list, select it and press the Remove Website button.

Deselecting that option will fully turn off Firefox’s pop-up blocker. Alternatively, you can keep the pop-up blocker on but add some sites you need pop-ups for to an exceptions list.

4. Switch off Pop-up Blocker Extensions

1. Press the Open menu button at the top right of the browser.
2. Click Add-ons to open the tab shown directly below.
   
3. Click Extensions on the left of the tab to open an add-on list.
   
4. 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 will surely fix your window pop-up problems in Mozilla. Make sure to share with us any feedback regarding the subject in the comment section below.

What does it mean when your computer says «Firefox prevented this site from opening a pop up window?

I went on a very legit site.

4 Answers

It means that you have set your Firefox browser to block all pop-ups, and it is doing it’s job. You can always allow pop-ups on Tools>Options. or you should have a small button that gives you the option to allow the pop-up.

Pop-ups are like spam that just automatically open. It is not anything to worry about. Firefox is letting you know because sometimes pop-ups are not spam and something you may want to look at, but you can’t because it is being blocked. You can change this in «Preferences»—«Content»—and click off the box that says, «block pop-up windows.» Or you can add exceptions (to the right of «block pop-up windows»), which allows only certain websites to have pop-up windows.

It means that under the Tools/Options/Content window you have the block pop up windows check marked. A lot of legitimate sites use pop up windows for advertising.

it means your firefox browser blocked a pop up (things that randomly pop up on the screen)

Window.open(“about:blank”) => firefox prevented this site from opening a pop-up window

When the JQuery function tries to open a new page in firefox, the message «firefox prevented this site from opening a pop-up window» is presented. As I understand based on Is window,open() impossible in firefox and Links to local page do not work this is a local problem that only happens because I am trying to access a file in my server from the «localhost». However, when this site will be realy working, other people will not have the same problem just because they are not accessing their own server. Does this interpretation make sense? Or I am wrong and I have to deal with this problem? By the way, it is easy to solve locally this problem since I have only change the preferences of firefox. My worries are related with the other people accessing my web site.

For reference, this is my code:

1 Answer 1

You cannot open a popup except in response to a direct user action. Since you delay the window.open until the post reply finishes, it is no longer directly in response to the user’s click, and therefore the popup blocker will stop it.

This will happen for everyone, and you cannot change the behavior. You could try opening the window before you submit the post, and only filling it in when the post returns — just move the window.open line up one to just before $.post

Not the answer you’re looking for? Browse other questions tagged php html firefox or ask your own question.

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Firefox prevented this site from opening pop up windows

Since upgrading to Firefox 13, I am having problems with sites opening new, resized windows with the drop down menus (File, Edit, etc.) and other toolbars disabled or removed. I have uncheck all the Advanced options in the Enable Java Script section of the Firefox Options menus, but this does not seem to have done the trick.

Bottom line: I want these pages to open, but I don’t want the Window resized or my menus and toolbars disabled. I thought I had this problem licked, but it seems to have resurfaced with Firefox 13.

Выбранное решение

You can change some hidden preferences using about:config to control features in those pop-up windows:

If this reply solves your problem, please click «Solved It» next to this reply when signed-in to the forum.

Все ответы (2)

Выбранное решение

You can change some hidden preferences using about:config to control features in those pop-up windows:

If this reply solves your problem, please click «Solved It» next to this reply when signed-in to the forum.

Thanks, Safebrowser, for your prompt and helpful reply.

I tried those about:config preference changes (changed them all to «true»). This solved the problem of the disappearing menus and toolbars. It didn’t solve the problem of some sites that opened a new full-screen window that could not be resized.

I messed about a bit and found the culprit. It was a setting in the add-on Tab Ultilities Lite that allowed «resized popups» to open in a new window. (See attached screen capture.) I unchecked that option, and the «pop-up» now opens in a new tab that can be resized.

Anyhow, thanks again.

Изменено 22 июня 2012 г., 12:20:11 -0700 ln108

Pop-up blocker settings, exceptions and troubleshooting

This document explains all of the settings available in Mozilla Firefox for controlling pop-ups.

Table of Contents

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 Options Preferences Settings Preferences . 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 in the address bar.

When you click either the Options Preferences Settings Preferences 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 this site
• Edit Pop-up Blocker Options Preferences …
• Don’t show this message when pop-ups are blocked
• (show the blocked pop-up)

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 and select Options . Preferences . Settings .
2. Select the Privacy & Security panel.

• Under the Permissions section, uncheck the box next to Block pop-up windows to disable the pop-up blocker altogether.
• A click on Exceptions… opens a dialog box with a list of sites that you want to allow to display pop-ups.
• The dialog box offers you the following choices:
  

Allow: Click this to add a website to the exceptions list. Remove Website: Click this to remove a website from the exceptions list. Remove All Websites: Click this to remove all of the websites in the exceptions list.

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 Site Info button the Tracking Protection button and the Site Identity button (a shield and a padlock) in the pop-up window, the pop-up is coming from Firefox.
• If you don’t see the button 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 and select Options . Preferences . 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 press 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 SurveyGizmo, which has been vetted by our legal and privacy teams. The Firefox pop-up blocker doesn’t block these pop-ups.

These fine people helped write this article:

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