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About this Add-on
As several people have said in comments, it is possible to open images in new tabs or windows by pretending the menu item for "View Image" is a link in a page - middle-click or ctrl-click for a new tab, shift-click for a new window.
While for some people this may be ok, for others it is unintuitive - I, for one, did not know until the comments started coming in that the menu item could be treated like a link. That is why this extension exists - for those who find this behaviour unintuitive and prefer a separate menu item. Even though I now know of the behaviour, I still don't find it "normal" to middle-click a menu item; I'm sure there are other people in the same position.