macOS Catalina introduced a security feature designed to prevent malicious software from tricking you into turning on a Safari extension. In some cases, this feature can be affected by the use of legitimate software that has certain screen-recording or accessibility features. If that happens:
- You may see a message stating that Safari has detected an app or service that's interfering with clicking.
- You may be unable to turn on Safari extensions in Safari preferences. You can deselect a tickbox to turn off an extension, but you can't select a tickbox to turn it on.
Install the latest Apple software updates, then try again. If you still can't turn on Safari extensions, start your Mac in safe mode by pressing and holding the Shift key as your Mac starts up. Turn on any Safari extensions that you want to use, then restart your Mac normally.
This document will be updated as more information becomes available.