In the Pop-ups section, ensure the Block pop-up windows checkbox is selected, then click the adjacent Exceptions.In the left sidebar, click on the Content icon to display the Content section.Select Options (Windows) or Preferences (macOS).In Firefox's URL window, highlight the entire web address of the current page, then choose the Copy command from the Edit menu or right-click and choose the Copy command.Open Firefox, then go to the web page that you want to allow pop-ups.In this example, you must allow, not Note also that entire websites must be allowed, not individual directories or pages, so in this example Chrome will automatically add the top level to its Allowed sites. For example, you might visit but the page is actually hosted at /forms/popupform.html. Notes: Pasting the web address of a page you wish to allow pop-ups is recommended, rather than typing the generic main web address. In the Hostname pattern field, choose the Paste command from the Edit menu or right-click and choose the Paste command, and ensure the Behavior dropdown menu is set to Allow.Scroll to the Pop-ups section, and then ensure the Do not allow any site to show pop-ups radio button is selected.