You try to open a document – in this case, one of Firefox’s bookmarks – and nothing happens. What could be wrong? It turns out it’s a bug, of course. But where?
LaunchServices
Mojave checks newly-installed apps which are not from the App Store more thoroughly, and handles notarized apps differently too. Here are some details.
Last of 3 articles explains how macOS selects and starts the app with which to open a document which you double-clicked/tapped.
Second of 3 articles explains how macOS puts documents through its security checks before opening them.
How does macOS open the document that you double-click/tap? First of 3 parts explaining what should happen and where it can go wrong.
The moment you start writing apps that work with documents, you’ll need to know how to use UTIs. That requires inspired searching, guesswork, and trial and error.
Additional information is now shown for UTIs, it has its own custom app icon, and works wonderfully in Dark Mode.
Want a non-sandboxed app to install itself in Login Items? Here’s a simple way without using a helper app.
When you want software to run automatically each time you Mac starts up, there are several ways of doing that. Here’s your choice.
Preciziun can now open documents from their macOS Bookmarks, and preview them in Quick Look.
The Eclectic Light Company 