Mozilla says the Thunderbolt client supports many of the now-familiar AI interfaces and use cases, including “chat, search, research, automation, and cross-device workflows.” Native apps for Windows, Mac, Linux, iOS, Android, and the web are available for direct download or can be built from React source code via a GitHub repository.

Mozilla is already encouraging potential enterprise clients to reach out to coordinate paid licensing and on-site deployments, even as the GitHub page warns that Thunderbolt is “under active development, currently undergoing a security audit, and preparing for enterprise production readiness.”

Thunderbolt is funded by a grant from Mozilla and is operated by the MZLA Technologies subsidiary that was formed in 2020 to manage the Thunderbird email client. It builds on Mozilla’s existing efforts in the AI space through the Mozilla Foundation’s Mozilla.ai, which backs open source tooling for external AI models and agents.

In late 2025, Mozilla announced its aim to “do for AI what we did for the web” by offering AI services with more agency, diversity, and choice through a “decentralized open source AI ecosystem that matches the capabilities of Big AI.”