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Greasemonkey userscript to turn an image thread into a slideshow - currently works with Tumblr and 4chan, more to come
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License.txt Refactored init and start code, added ability to navigate slides with… Updated README, and straightened out include/match order
slidify.user.js Fixed some https bugs
supersized.forch.js Added Forch theme, a simplified theme based on Supersized's default S…



Slidify is a Greasemonkey script to turn any image thread into a full-browser slideshow. It currently works with Tumblr and 4chan, though the goal is to make it work with more image-focused sites, either through parameterizing the correct images via a jQuery selector or Javascript function, or via a more complicated algorithm to determine relevant content images (as opposed to say, ads).

It has options for random ordering, slide speed, and shrinking images to fit the screen. To get a fullscreen view, use your browser options, e.g., for Chrome and Firefox on a Mac, it's Shift+Cmd+F. Under Windows, it should be F11.


Go to and click on the green "Install" button.


Tested in Chrome and Firefox, though only on a Mac. I've also tested it with the 4chan Chrome extension, and it plays nice with it.

Known bugs

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