Issue with Safari extensions on Mac

Hi all.
I've installed and successfully enabled two Safari extensions on my Mac, Ghostery and Redirect Web. In both cases, a button has been added to the toolbar in Safari, which if selected, theoretically gives you options. In the case of Ghostery for example, if it's the same as its iOS counterpart, allows you to suspend it on the current site and view information about what it has detected and blocked on that site.
However on the Mac, I seem unable to access the pop-up dialogues that appear when I select these toolbar buttons. I select the button, but as soon as I attempt to arrow or interact, it disappears. A second window appears in the window chooser menu, but this is empty content.
Am I doing something wrong or is this feature broken with VoiceOver?
Note I am on Mac OS 15.6.1, as I have not been brave enough to update to Mac OS 26 yet.
Cheers,
Dave