I have a Safari App Extension that uses an instance of WkWebView to run JavaScript code. This app extension runs flawlessly with Safari 13 & 14, but Safari 15 occasionally kills the WkWebView instance for no apparent reason. The only thing logged to the console is this message: (JavaScriptCore) Received an invalid message "<unknown message receiver>.<unknown message>" from the web process. SafariExtension: (WebKit) [com.apple.WebKit:Process] 0x10c2e9300 - WebProcessProxy didClose (web process crash) SafariExtension: (WebKit) [com.apple.WebKit:Process] 0x7ff1e7048020 - [pageProxyID=5, webPageID=6, PID=22131] WebPageProxy::processDidTerminate: (pid 22131), reason 3 I can't find any correlation between the JavaScript that's running and that error. The error seemingly occurs at random. Has anyone else experienced such a problem? Thanks

I have a Safari App Extension that uses an instance of WkWebView to run JavaScript code. This app extension runs flawlessly with Safari 13 & 14, but Safari 15 occasionally kills the WkWebView instance for no apparent reason. The only thing logged to the console is this message: (JavaScriptCore) Received an invalid message "<unknown message receiver>.<unknown message>" from the web process. SafariExtension: (WebKit) [com.apple.WebKit:Process] 0x10c2e9300 - WebProcessProxy didClose (web process crash) SafariExtension: (WebKit) [com.apple.WebKit:Process] 0x7ff1e7048020 - [pageProxyID=5, webPageID=6, PID=22131] WebPageProxy::processDidTerminate: (pid 22131), reason 3 I can't find any correlation between the JavaScript that's running and that error. The error seemingly occurs at random. Has anyone else experienced such a problem? Thanks

I have a need to be able to draw a rectangle anywhere on the screen over any application even if the application is in full screen mode. I've gotten suggestions to create a transparent window the size of the desktop and draw the rectangle in it, but that method won't work when the active app is in full screen mode. I presume that it's possible to do this being that there are screen annotation applications that can do such things, so I'm looking for suggestions as to how to accomplish this? Thanks in advance