The FlickrPlus extension adds a collection of links to the Flickr photo page sidebar. The links provide quick access to Flickr actions such as viewing an image on a black background, obtaining its short URL, seeing all sizes of the image, and more.
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Download the compiled extension.
NOTE: The links should work, but if you're sent to a page of jibberish, you may have to right click (or option-click) and select one of the "Download Linked File" options.
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Double click the downloaded file to install.
Additional information is located on the project wiki.