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Click on "Clone or Download" in Github and download the ZIP file.
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Unzip the file and place it anywhere you want it to live.
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Type chrome://extensions/ in your Chrome address bar.
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Click "Developer Mode" in the upper right.
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Click "Load unpacked extension" and choose the folder you unzipped to in step 2.
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Once loaded, check the "Allow incognito" under the extension
Now, whenever you visit a page on imgur, you can right click and click "View User's Albums Privately!".