In simple terms, link rot is when the contents of a link you saved from the past is longer available.
Firefox sync does save the link url itself, but the actual content is susceptible to being taken down for any reason.
A tool like Linkwarden both saves the link url as well as the content itself, so you’ll have a copy even if the original content is lost. All while taking collaboration into account.
Hahaha, appreciate the support! :D