I'm having a first look at Safari App Extensions (1) and so followed Apple's tutorial at this URL:
While clicking on the - button does produce a log entry, the dispatched message sent by the script.js injected script never appears (2) when loading or reloading a page.
I'm currently running this thing as an unsigned application/extension (as is the case in the tutorial).
Question:
Which instructions am I missing to make this simple example work?
1. Based on what I'm reading on this forum and because of the OS minimum requirements, I will probably look into a Safari Extension anyway.
2. Logging is working fine on this macOS 10.3.2 system, the "Month 13 is out of bounds" message is repeated dozens of time …