Thanks for the update...
Now, there's no perfect software out there and I'm pretty sure there can be a few bugs into my addon as well but I try to fix them as soon as possible if they really brake the functionality. If you ever have problems again please don't have any reservation in using the feedback option from the addon to contact me because It's way faster to discuss about certain issues and understand better how to deal with that and I can assure you that I do everything possible to fix problems very fast.

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Hi. Any chance You can contact me directly over email to solve this issue. It may happen that some bookmarks were saved wrong somehow (it's fixable). If the page is really one of those links then that's not an issue, but If the page is suppose to be a web page then maybe it was saved wrong. Anyway I need to know what URL did the page had, if it's not a restricted URL then probably like I said maybe after a Firefox update or add-on update something was saved wrong. There was another user that had a similar problem and we fixed it.