Editing an animated GIF [closed]

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I'd like to edit an animated gif to change its background from white to #f5f5f5:

Photoshop can import it and shows as layers, but saves only the first frame. Are there any editors, preferably online tools that allows it?

Many thanks for your help!

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Graphics Gale is used by a lot of pixel art guys, it is rather good for working with animated GIFs.