Originally Posted by acapela
yes, my point being that: if i want to randomize N signature images, and i often have more than N posts visible on any given page of my addon's comments, then if perfectly random all N images would be downloaded on the typical page view there, and in terms of bandwidth that would materially be no different than a single animated GIF containing the same N images.
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It doesn't work that way though. You can influence the browser to reload the image each time it is "viewed", but it will only load the url
once per page. If they reloaded the page, all yours sigs can change, but they'll still change to the new randomly picked image.
(Technically, I guess a browser could reload the image again every time it's seen in a page, but I don't know any browser that does that.)