1. On the menu bar, click on the Firefox menu and select Preferences...
2. Select the Content panel.

In the content panel:

• Block pop-up windows: Uncheck this to disable the pop-up blocker altogether. 

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.

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 dialogue.

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.