I have never tested that. I will have to into it
Discussion
I cannot seem to get it working, even after granting it permission. I cannot find any documentation from Apple on the matter one way or the other, but I would not be surprised if they have disabled web extensions on PWAs.
thanks! I found that using shortcuts instead of bookmark to homescreen opens it in safari proper… I’m fine with that personally… other pointed out there is some benefits to using a web app full screen. But i suspect the way apple handles WebKit and extensions they won’t allow it.