Internet Explorer
http://windows.microsoft.com/en-us/internet-explorer/ie-security-privacy-settings#ie=ie-11

To turn Pop-up Blocker on or off

1. Open the desktop, and then tap or click the Internet Explorer icon on the taskbar.
2. Tap or click the Tools button , and then tap or click Internet options.
3. On the Privacy tab, under Pop-up Blocker, select or clear the Turn on Pop-up Blocker check box, and then tap or click OK.

Chrome
https://support.google.com/chrome/answer/95472?hl=en

Google Chrome prevents pop-ups from automatically appearing and cluttering your screen. Whenever the browser blocks pop-ups for a site, the icon appears in the address bar. Click the icon to see the pop-ups that have been blocked or to manage pop-up settings for the site.

If you're having trouble blocking pop-ups, saving your homepage, startup page, or search engine, then you may have malware. Get help restoring your settings.

See pop-ups for a specific site

To see blocked pop-ups for a site, follow the steps listed below:

1. If pop-ups have been blocked, you'll see the icon in the address bar. Click the icon to see a list of the blocked pop-ups.
2. Click the link for the pop-up window that you'd like to see.
3. To always see pop-ups for the site, select "Always show pop-ups from [site]." The site will be added to the exceptions list, which you can manage in the Content Settings dialog.

To manually allow pop-ups from a site, follow the steps below:

1. Click the Chrome menu on the browser toolbar.
2. Select Settings.
3. Click Show advanced settings.
4. in the "Privacy" section, click the Content settings button.
5. In the "Pop-ups" section, click Manage exceptions.

Allow all pop-ups

You can allow all pop-ups by disabling the pop-up blocker. Follow these steps:

1. Click the Chrome menu on the browser toolbar.
2. Select Settings.
3. Click Show advanced settings.
4. in the "Privacy" section, click the Content settings button.
5. In the "Pop-ups" section, select "Allow all sites to show pop-ups." Customize permissions for specific websites by clicking Manage exceptions.

FireFox
https://support.mozilla.org/en-US/kb/pop-blocker-settings-exceptions-troubleshooting

Pop-up blocker settings

To access the pop-up blocker settings:

1. Click the menu button  and choose Options
2. Select the Content panel.
   
   

In the content panel:

• Block pop-up windows: Uncheck this to disable the pop-up blocker altogether.
• Exceptions: This is a list of sites that you want to allow to display pop-ups.
  
  
  The dialog has the following choices:
• Allow: Click this to add a website to the exceptions list.
• Remove Site: Click this to remove a website from the exceptions list.
• Remove All Sites: Click this to remove all of the websites in the exceptions list.