If I get a mail message that includes a weblink, it has always been possible to open the web page while keeping Mail in the foreground. This is done by either holding down the CMND key while clicking the link, or by bringing up a contextual menu and choosing “Open Link Behind Mail”.
Right around the introduction of Sonoma, this stopped working reliably in Safari. About 70% of the time doing this will open the web page and bring the browser window to the foreground. It seems to work perfectly in other browsers.
Has anyone else noticed this? I’m wondering if I should report it as a bug.