For close to a decade my business revolved around a common bug in both Microsoft and Netscape, the dominant browsers of the day. With every release we were thinking 'this time they'll fix it' and that would have caused us some serious headaches. But they never did!

I was curious what the commenter's business was, and found this post about HTTP protocol latency: https://jacquesmattheij.com/the-several-million-dollar-bug/