How can i Download image from firebase

If you use the canvas, once you fetch the base64 string from the firebase tag, set the canvas background using the backgroundImageFromBase64 block, to display the image in the canvas. If you want to save the image as a file, then use the canvasSaveAs block to save the image to file on your ASD.

Best extension to use to convert a base64 string back to an image is:

Also see here: