Policy
Pop-up allow list
This policy setting allows you to specify a list of web sites that will be allowed to open pop-up windows regardless of the Internet Explorer process's Pop-Up Blocker settings. If you enable this policy setting, you can enter a list of sites which will be allowed to open pop-up windows regardless of user settings. Only the domain name is allowed, so www.contoso.com is valid, but not http://www.contoso.com. Wildcards are allowed, so *.contoso.com is also valid. If you disable this or do not configure this policy setting, you will not be able to provide a default Pop-up Blocker exception list. Note: You can disable users from adding or removing websites to the exception list by enabling "Turn off Managing Pop-up Allow list" policy.
88da0afd1aa8 PopupBlocker_AllowList Registry
Copy registry mappings
HKLM\Software\Policies\Microsoft\Internet Explorer\New Windows\ListBox_Support_Allow (enabled) = 1
HKLM\Software\Policies\Microsoft\Internet Explorer\New Windows\ListBox_Support_Allow (disabled) = 0HKCU\Software\Policies\Microsoft\Internet Explorer\New Windows\ListBox_Support_Allow (enabled) = 1
HKCU\Software\Policies\Microsoft\Internet Explorer\New Windows\ListBox_Support_Allow (disabled) = 0HKLM\Software\Policies\Microsoft\Internet Explorer\New Windows\Allow\ListBox_Support_AllowHKCU\Software\Policies\Microsoft\Internet Explorer\New Windows\Allow\ListBox_Support_AllowPolicy notes
This policy setting allows you to specify a list of web sites that will be allowed to open pop-up windows regardless of the Internet Explorer process's Pop-Up Blocker settings. If you enable this policy setting, you can enter a list of sites which will be allowed to open pop-up windows regardless of user settings. Only the domain name is allowed, so www.contoso.com is valid, but not http://www.contoso.com. Wildcards are allowed, so *.contoso.com is also valid. If you disable this or do not configure this policy setting, you will not be able to provide a default Pop-up Blocker exception list. Note: You can disable users from adding or removing websites to the exception list by enabling "Turn off Managing Pop-up Allow list" policy.