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Undo Twitter's insistence to down-res images when viewing on its dedicated page and add a button to download the full image without the weird file extensions which don't count as actual images.
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Retrieves the original resolution image from Twitter, once the image has been viewed directly through its URL (usually via right-click -> Open image in new tab). Also adds a button to download the image (on said page), automatically renaming it to the proper file extension (as opposed to .jpg-large which is due to Twitter's abuse of URLs).