Kevin Purdy, writing at Ars Technica about a fun Firefox story:
Back in June 2002, Ubuntu founder Mark Shuttleworth was experiencing space for the first time, the Department of Justice’s antitrust case against Microsoft was reaching its final arguments, and Adam Price, using what was then called Mozilla on a Mac, had an issue with persistent tooltips.
“If I mouseover a toolbar link, and wait for a second, a little yellow box with the description of the link appears. If I now use command-tab to move Mozilla to the background, the little yellow box stays there, in the foreground. The only way to get rid of it is to put mozilla in the foreground again, and move the mouse off the toolbar,” Price wrote on June 2. There were a few other bugs related to this issue, but Price set down a reproducible issue, confirmed by many others in the weeks to come—and months to come, years to come, and more than two decades to come.
This bug remained in place until a month ago, when a 23-year-old named Yifan Zhu patched it.