Honestly I'm somewhat surprised people actually use that link. Personally I only use Calibre to send books to my Kobo so my workflow doesn't really involve those links at all. I have noticed that ISBN is not actually that great of a unique identifier on Kobo, but I haven't found a better one yet (relying on the kobo url also seems kinda iffy).
What are people doing with Calibre that makes this an issue? Perhaps I can remove the functionality of the extension offering those links entirely instead.
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