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Try shift-right-clicking the image. It'll open the regular browser context menu so you can use open/save image from there. In Firefox middle-clicking "view image" opens it in a new tab.
Great script! I would really like the option to be able to middle click to open a image in a new tab. (Sometimes I just want to download one image, not the whole group and I cant do that with drag and drop because script disables function).
If you did this the script would go from 9/10 to 10/10 for me.