Why doesn’t the redirection to an external site work?

If you have your petition redirect to a different URL after signing and you also have checked the option target=”_blank” hoping it will open in a new window, it is unlikely to work as you expected.

The issue is that spammers and scammers have abused the browser popup function and it is now blocked by default.

You can still do it, but your visitor may have to explicitly allow the popup.