Eureka! Rated 3 out of 5 stars
Many thanks to Michael for devising the fix but most of all thanks to anonymous reviewer .. whose post on 22 January provided details of the fix. I implemented the repair that he outlined and voilà! It worked like a charm in 3.0.17. Once again, thanks to both Michael and anonymous. We can only hope that the developer of Abduction will incorporate these relatively simple fixes and publish them in the next release ASAP.
And after all that time and effort, Abduction! is not radically better than other screen capture add-ons available like Screengrab (fix version) and/or FireShot. Screen Capture Elite used to be a viable candidate, but it, too, behaves badly with FF18.