Anti TwitterSpam is a free browser extension designed for Firefox that effectively hides spam on the X platform (formerly Twitter). This tool operates without any complicated settings; users simply install the extension, and spam is automatically filtered out. It offers functionality to mute, block, and hide tweets from specific users, while also addressing some forms of spam that lack authentication marks. The extension features a whitelist option to mitigate false positives, allowing users to manage which accounts are filtered out.

Targeting both the replies and notifications sections, Anti TwitterSpam is adept at eliminating unwanted spam content including tweets that consist solely of emojis or misleading information. However, it is important to note that the detection rate is not flawless; some spam accounts may go undetected, while legitimate users might be incorrectly flagged. This extension is primarily tailored for Japanese users, which may affect its performance with non-Japanese languages.