4chan now has a full-featured, inline extension. Read more about it on the news page. The extension is open source and on GitHub. Some features are enabled by default—to disable, click [Settings] in the upper right-hand corner and select "Disable the extension".
In addition to the extension, 4chan now has a read-only JSON API. Crude documentation is available on GitHub.
Note: We accidentally broke 4chan X with the update—fear not, Mayhem just pushed a fix.
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