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Thank you!

If I hover or right-click the Firefox icon on the Windows 7 Taskbar, it definitely has some kind of "blush" to it that I don't remember seeing before.

Several aspects of the theme changed in Firefox 57, so possibly this is also from that update.

I wondered if it might not be a result of an update, but I'm glad to hear that someone else has experienced this "blush" or "flush" too -- good description! Possibly, the Firefox has become embarrassed or hot?

Where is that showing at? A more complete screen shot of the problem helps others identify where it is coming from.

Hi WestEnd, it's on the Windows 7 task bar. If you hover your mouse over the icon while Firefox is running, it gets a "glow."

Here is a comparison between the Extended Support Release of Firefox 52 -- pale orange blush -- and Firefox 57. Perhaps the shift toward more red is due to the change in the colors of the "fox" (red panda).

Thanks, jscher2000. Your observation of the difference between the blushes of Ff 52 ESR & 57 is interesting. The pink/red blush appears to me as a warning or indication for concern.

That phenomenon is called 'Color Hot-Track' .....

See :

https://www.sevenforums.com/general-discussion/155822-reddish-colour-taskbar-2.html

Another page that discusses this "Color hot-track" feature.

• https://blogs.msdn.microsoft.com/oldnewthing/20111206-00/?p=8963

It seems to part of Aero, so if you would disable Aero then this glowing will be gone.

Found this :

https://helpx.adobe.com/x-productkb/global/disable-windows-aero-windows-7.html

And this :

https://www.justanswer.com/computer/4jlx3-trying-disable-taskbar-icon-hot-tracking-talked.html