The glitch was basically an irritating display error that occurred when users switched focus to a new app.
“If I mouseover a toolbar link, and wait for a second, a little yellow box with the description of the link appears,” reads the“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.”
The bug report attracted many supportive comments over the years, with other users reporting the same problem. Although it was originally reported as an error on Macs, early commenters reported seeing the same bug in Windows 98. Others say it existed in other Mozilla products, such as the Thunderbird mail client.Without any fanfare, Mozilla marked the bug as resolved about a month ago, leading to an outbreak of celebrations on social media in the past few days.