Seen It
Auto-skip Imgur posts you've already seen
Scroll through Imgur how you normally do. Frontpage, usersub, whatever you want. Seen It saves the images you see.
When you land on a post you've already seen, Seen It will skip past the post automatically. Super simple stuff.
You can click the icon to show the options. From there you can enable/disable skipping images and storing images. You can also delete all your image history if you want.
All the code is open source at github.com/asarode/seen-it. Your pull requests are very welcome!