GIMP How to make existing gif background transparent - Graphic Design Stack Exchange

I have the following gif, how to make the grey background transparent if not white?

How to make a GIF with a transparent background?

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How to make a GIF with a transparent background?

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transparency - GIMP - How to make a GIF with transparent background - Graphic Design Stack Exchange

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GIMP How to make existing gif background transparent - Graphic Design Stack Exchange

transparency - GIMP - How to make a GIF with transparent background - Graphic Design Stack Exchange

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