Safari (macOS)
Safari for macOS has no per-website control over blocking pop-up windows. Pop-ups are either blocked, or they are not. To allow pop-ups:
From the Safari menu, choose Preferences… and click the Security tab
Ensure the Block pop-up windows option is not checked. Unchecking this option will allow pop-ups.
To block pop-ups once again, check the Block pop-up windows checkbox.
Notes: If you are concerned about allowing pop-ups globally for all websites that you browse, consider using another web browser that allows website exceptions such as Chrome or Firefox.
Chrome (macOS/Windows)
Open Chrome, then go to the web page that you want to allow pop-ups.
In Chrome’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.
Click the icon with three horizontal bars in the upper right side of the browser toolbar.
Click Settings.
Scroll to the bottom of the Settings section and click Show advanced settings…
In the Privacy section, click Content settings… The Content settings window appears.
Scroll to the Pop-ups section, and then ensure the Do not allow any site to show pop-ups radio button is selected.
Click Manage exceptions…
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.
Firefox (macOS/Windows)
Open Firefox, then go to the web page that you want to allow pop-ups.
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.
Click the icon with three horizontal bars in the upper right side of the browser toolbar.
Select Options (Windows) or Preferences (macOS).
In the left sidebar, click on the Content icon to display the Content section.
In the Pop-ups section, ensure the Block pop-up windows checkbox is selected, then click the adjacent Exceptions... button.
In the Address of web site: field, choose the Paste command from the Edit menu or right-click and choose the Paste command, and then click Allow.
Edge (Windows)
Microsoft Edge for Windows 10 has no per-website control over blocking pop-up windows. Pop-ups are either blocked, or they are not. To allow pop-ups:
Click the ellipsis icon (…) in the upper right corner of your web browser, and then click Settings.
In the Advanced settings section, click View advanced settings.
In the Block pop-ups section, click the switch to Off. Pop-ups are now allowed.
To block pop-ups once again, click the switch to On.
Notes: If you are concerned about allowing pop-ups globally for all websites that you browse, consider using another web browser that allows website exceptions such as Chrome or Firefox.