How to Disable the Pop-Up Blocker in Firefox

Not all pop-ups on websites are annoyances

A man uses a laptop computer.
A man uses a laptop computer. Nick David/Getty Images

Pop-up blockers prevent unwanted windows from opening without your permission on some websites. These pop-ups usually display ads and are often intrusive and annoying. The aggressive variety can be frustratingly difficult to close. Worse still, they can potentially slow down your computer by consuming resources. Pop-ups can appear on top of your browser window, or they can open up behind your browser window—these are sometimes called "pop-unders."

The Firefox Pop-Up Blocker

The Firefox Web browser from Mozilla comes with a pop-up blocker that is active by default.

Most of the time, pop-up blockers are useful to have active, but some legitimate websites use pop-up windows to display forms or important information. For example, your bank's online bill paying service may use a pop-up window to display your payees, such as credit card companies or public utilities, and the form you use to make payments to them. Blocking these pop-ups is not useful.

You can disable the pop-up blocker, either permanently or temporarily. More importantly, you can selectively permit pop-ups on specific websites by adding them to an exclusion list.

How to Disable the Firefox Pop-Up Blocker

Follow these steps to change how the Mozilla Firefox pop-up blocker functions.

  1. Go to the Menu icon (three horizontal bars) and click on Preferences.
  2. Select Content.
  3. To disable all pop-ups:
    • Uncheck the "Block pop-up windows" box.
  1. To disable pop-ups on just one site:
    • Click on Exceptions.
    • Enter the URL of the website for which you want to allow pop-ups.
    • Click Save Changes.

Firefox Pop-Up Blocker Tips

If you permit pop-ups for a site and want to remove them later:

  1. Go to Menu > Preference  > Content > Exceptions.
  2. In the list of websites, select the URL you want to remove from the Exceptions list.
  1. Click on Remove Site.
  2. Click Save Changes.

Note that not all pop-ups can be blocked by Firefox. Sometimes ads are designed to look like pop-ups and those ads are not blocked. The Firefox pop-up blocker doesn't block those ads. There are add-ons available for Firefox that can help with blocking unwanted content such as ads. Search the Firefox Add-Ons website for additional features that can be added for this purpose, such as Adblock Plus.