x-zombie-killer is a Chrome browser add-on developed by itokoba67. This free tool aims to filter out specific types of content on X (formerly Twitter). The add-on automatically hides Arabic, Sanskrit, Devanagari, and (old) Marathi characters, as well as posts consisting only of emojis and other Japanese spam expressions.

In its free version, x-zombie-killer efficiently removes unwanted content from X, allowing users to customize their browsing experience by filtering out specified characters and words automatically. Future paid features are planned to enhance content filtering capabilities by hiding posts containing languages other than Japanese and English, symbols, preventing copy-paste posts, concealing accounts that reply multiple times to a single post, and hiding accounts without Japanese characters in their names.