Samsung Galaxy Note 3 — What does color of circle in icon of Widgets 'Active apps manager' mean?

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Sep 17, 2015 3:13:11 AM via Website

What does color of circle in icon of Widgets 'Active apps manager' mean?

As we know, on our Samsung Galaxy Note 3, there is a Widgets named with 'Active apps manager'. Its icon is a circle with a digital char in it. The digital char might stand for number of current active apps.

I found that sometimes the color of this circle is green while sometimes it becomes green and yellow, even sometimes it becomes red.

I wonder what the color means.
Thank you in advance.