I have an injection script--a start script--whose ultimate goal is to redirect to a different URL. That injection script needs to access the extension settings, so it sends a message to a global HTML file. That global file checks the settings and redirects to the appropriate URL by setting the safari.application.activeBrowserWindow.activeTab.url property.
What I'm finding is that all too often, the interim page loads first making for an annoying UX at best and introducing errors at worst. I'm assuming that this is a result of the asynchronous nature of messaging, but I haven't been able to find a way to stop it.
Is there any way to prevent the default behavior (loading the originally requested page) while still reading from extension settings?
Thanks.