Popup Blocking

Another attractive feature of Firefox is it's ability to blockup ads
which is built into the browser.

When you encounter popup ads there are several ways its indicated. 
There will be a toolbar that appears right underneath the tab toolbar
when you encounter a popup.

There will also be an X in the bottom lower right-hand corner of the
screen.  If you click on either of these you'll get the same options.

To allow popups from the site that your at.  Edit popup blocker options
or show the ad this one time.  It also not to show anymore information.

If you edit popup blocker options you'll be then taken to a menu. Where
you'll be able more enter than one site that you would like to allow
popups from.

If you choose to select: Don't show this message anymore.

When popups are blocked it will inform you that then the only way that
it will be indicated that popups have been blocked is there will be an X
in the lower righthand corner of the screen.

If you want to go back to the Edit popup blocker options.  You'll want
to go to Tools and then select Options, go to Web Features and then in
Web Features select the allowed sites of the popup windows.

Then here you'll be able to add more sites or remove them if you don't
want them any longer.