Safari扩展文档提到可以创建隐藏的浏览器标签:https://developer.apple.com/library/archive/documentation/Tools/Conceptual/SafariExtensionGuide/WorkingwithWindowsandTabs/WorkingwithWindowsandTabs.html#//apple_ref/doc/uid/TP40009977-CH17-SW1
browserWindow.openTab()—creates a new tab at any point in the array. The tab can be hidden.
然而,没有进一步提及如何实现。