How do I control the popup blocker settings in Firefox?

The Popup Blocker Options/Preferences are located in the Content panel of
Tools > OptionsEdit > PreferencesFirefox > Preferences.

From there, you can do the following things:

• Block Popup Windows: Deselect this option preference to
  disable the popup blocker altogether.

• Exceptions dialog: This is a list of sites that you want to allow
  to display popups. The dialog has the following choices:

o Allow: Click this to add a web site to the exceptions list.o Remove Site: Click this to remove a web site from the exceptions list.o Remove All Sites: Click this to remove all of the web sites inthe exceptions list.

Note: Blocking popups may not always work and may interfere with
some web sites.