Here’s what happens for me:
- In Firefox, I navigate to a web page that displays a PDF, for example, https://ocw.mit.edu/courses/mathematics/18-s097-applied-category-theory-january-iap-2019/lecture-videos-and-readings/chapter-1-generative-effects-orders-and-adjunctions/18-s097iap19ch1.pdf
- I click the FF DT3 extension, but nothing happens: No web clip window appears. No item is added to the DT3 DB. Nothing appears in the DT3 log. The pdf is not imported.
I have granted DT3 permission to Firefox.app in the System Preferences>Security and Privacy>Privacy Tab>Automation. DT3 is also granted Full Disk Access.