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why is there two different icons in the taskbar for firefox on windows 10

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I've used Firefox off and on for the past ten years but this started happening a few days back. When I open Firefox by pressing the Firefox icon on my taskbar, it opens a separate column of Firefox windows. Since when did Firefox do this? I do not see any of the other applications doing this.

I've used Firefox off and on for the past ten years but this started happening a few days back. When I open Firefox by pressing the Firefox icon on my taskbar, it opens a separate column of Firefox windows. Since when did Firefox do this? I do not see any of the other applications doing this.
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Hi zachariasn, Check on how many Firefox installations you have.