Pop-Up windows can be quite an annoyance. Fortunately, Firefox has a great built-in pop-up blocker.

It’s very easy to turn on:

Go to the top of your browser and click Tools > Options:

 

 

In the “Content” section, you’ll want to check the box labeled “Block pop-up windows”:

 

 

When you visit a site that normally has pop-up windows, you’ll see the following bar appear near the top of your browser window:

 

 

This bar alerts you to the fact that Firefox has blocked a pop-up. You can close the bar by clicking on the [x] in the right-hand corner.

But let’s say you’re visiting a site where you want the pop-up to appear?

In this case, you can click on the “Options” button in the toolbar. You’ll be given the following options:

 

 

Click on the green check mark to allow the pop-ups to appear for the site you are visiting.

The site will go on the “Exceptions” list. This is a list of sites that the pop-up blocker let’s through. You can edit the “Exceptions” list at any time.

To do so, go back to the top of your browser and click Tools > Options.

Then click the “Exceptions” button (as shown below):

 

 

The “Allowed Sites” window will appear:

 

 

From here, you can add sites to the list. You can also remove any individual site, or all of them at once.