2025 complete waste of time. all it does is pop up an interface that lists every icon you have followed by filename and browse button saying to 'select bookmark' when not a single one is select-able, its just a plain text list with no interface. Furthermore, that is ALL it does, and if I had to guess why (in order of likeliness) it would be:
1) The developer published it before it was finished and never got around to finishing it or taking it down.
2) Is for a long-outdated version of Firefox, which means it needs to be removed or updated, one or the other.
3) Is either a troll or clickbait for something else or even malicious in some way, though there is no indication of that
4) Is the product of some half-done "how to make an extension" tutorial
5) all of the above?
Though #1 is most likely, I myself believe it is #2 based on my experience with extensions and having been around a long time.

Simply doesn't work. If you click the extension, it asks you to select a bookmark. You see a totally expanded text list of all of your bookmarks, but you can't select one — they're just plain text.