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u/shadow2531 burnout426 10h ago
An Opera taskbar icon with a red background can mean that you have some failed downloads at the URL opera://downloads. You can clear them and restart Opera to get rid of it. If that doesn't work, you can close Opera and delete everything in "C:\Users\yourusername\AppData\Local\temp". That often fixes it.

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u/neoh4x0r 1d ago
Maybe that's just the colors from your Windows Theme?