Jump from 99 to 109 then let them break. Internal sites of universities and corporations need to work until they get fixed.
They were built by a PhD candidate in 2012 and the source has been lost to the mists of time. It's still critical to the research group's workflow though, so they switch to Edge instead of rewriting it . A month later they encounter an article on HN asking "Why is Firefox losing marketshare and how would you save it?"