How to Disable the Popup Blocker in Firefox

Not all popups on websites are annoyances

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

Popup blockers prevent unwanted windows from opening without your permission on some websites. These popups usually display ads and are often intrusive, annoying and sometimes frustratingly difficult to close in the more aggressive variety. Worse still, they can potentially slow down your computer by consuming resources. Popups 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 Popup Blocker

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

Most of the time, popup blockers are useful to have active, but some legitimate websites use popup windows to display forms or important information. For example, your bank's online bill paying service may use a popup 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 popups is not useful.

You can disable popup blockers, either permanently, temporarily, or selectively by permitting popups on specific websites.

If you use the Mozilla Firefox browser, follow these steps to change how its popup blocker functions.

How to Change Firefox Popup Blocker Settings

  1. Go to the Tools menu and click on Options.
  2. Click on Content.
  3. To disable all popups:
    • Uncheck the "Block pop-up windows" box.
  4. To disable popups on just one site:
    • Click on Exceptions.
    • Enter the URL of the site for which you would like to allow popups.
    • Close the window.
  1. Click Ok.

Firefox Popup Blocker Tips

If you permit popups for a site and want to remove them later:

  1. Follow the steps above up to Step 4.
  2. In the list of sites, select the URL you wish to remove.
  3. Click on Remove Site.
  4. Close the window.

Note that not all popups can be blocked by Firefox.

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, like Adblock Plus.