Didn't try to work. Selected an option to check duplicates, broken links or missing titles and the button to start remained grayed out on each one.

Developer: You mean like this other review you were quick to discredit and call fake that says the same thing I just did? You seem to not accept that your add on doesn't work for everyone and blame the user! This is a sign of developer arrogance. Your app is worthless if it doesn't work and it does NOT.

"I've installed it and I have a screen with a little box with 3 options of analysing bookmarks.

There are three balls rippling back and fore from small to large which I presume is telling me summat's happening, but - nothing's happening.

Half an hour now and Zero Bookmarks in the box on the screen.

Am I missing something ?

There IS also a box in which the words "Check bookmarks" appears. It is greyed out and cannot be selected."