Mass Block Twitter is a free Firefox extension designed to streamline the process of managing spam accounts on Twitter/X. This tool allows users to detect and block multiple spam accounts with a single click, significantly enhancing the user's experience on the platform. Key features include smart scanning, batch blocking, and the ability to import or export block lists for easy sharing.

Additionally, it leverages a community-driven shared blocklist, enabling users to benefit from collective reports of suspicious accounts. With enhanced keyword filtering and automatic hiding of heavily reported or suspicious accounts, this open-source tool provides a comprehensive solution for maintaining a clean Twitter feed.