Netscape's Pop-up Blocker is integrated into the browser, much like the Pop-up Blocker for Internet Explorer. To disable the Pop-up Blocker:
From the Edit menu, select the Preferences option. The following window will appear:
Click on the arrow beside the Privacy & Security option on the left-hand side of the window, to make it display the options shown above.
Click on the Popup Windows option.
Remove the checkmark from beside the Block unrequested popup windows option.
Click OK to close the window.
Once you are finished, you can go back into the menu again to turn on the Pop-up Blocker.