I like the new Stack Exchange top bar, but I have have noticed sometimes the Achievements popup icon is shown in green.

I am not talking about this one: enter image description here

Sometimes it shows this icon green:

enter image description here

like this:

enter image description here

Is it some type of feature or bug of Stack Exchange?

Note: I have notice it in Firefox and Safari.


It's a feature.

When you get an achievement that doesn't award reputation (for example, when you get a badge), the icon lights up green.

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