The cost of a dead bookmark hanging around is virtually zero and nowhere near the overhead (and small but non-zero risk) of another extension. Sometimes there

The cost of a dead bookmark hanging around is virtually zero and nowhere near the overhead (and small but non-zero risk) of another extension. Sometimes there is value in knowing that a site has gone under, versus you not being able to remember the URL. One can fetch dead URLs via Wayback machine. The chances of a site (or several) temporarily being unreachable out of all my bookmarks is very much non-zero and I could see this plugin trimming bookmarks unnecessarily.