Developers at Mozilla Festival

Join us in Barcelona to celebrate 15 years of Mozilla Festival.

For 15 years, Mozilla Festival has been the home for big ideas, bold conversations, and the movement for a better internet. This year, we’re bringing that energy back to Barcelona, and you’re invited to be a part of it.

From November 7-9, we’re gathering 3,000+ technologists, activists, educators, artists, and everyday users for three days of workshops, talks, labs, and art to reimagine the role of technology in our lives.

This is your space to challenge assumptions, prototype alternatives, and unlearn the systems that shape our digital world.

Topics we’re diving into—for builders, debuggers, and doers

Unlearning Default Design

Confronts the design principles and systems that fuel the technology ecosystem, re-imagining “one-size-fits-all” solutions.
Unlearning Default Security

Challenges the myth that technology is secure by default, and explores approaches to digital safety that transparency and digital autonomy.
Unlearning Harmful Tech Systems

Focuses on unpacking harmful tech systems and exploring action-oriented strategies to ethically build an alternative tech future.

Secure your Community Badge for €45

€45

Community Badge

Available for everyone. Your all-access pass to the full festival experience. From mainstage debates to hands-on sessions, this badge puts you in the room where bold ideas for the digital world take shape.

Buy Community Badge

€399

Benefactor Badge

Step further into the festival experience. Benefactor Badges help enable community pricing and offer early glimpses, shared moments, and meaningful ways to connect throughout Mozilla Festival.

Buy Benefactor Badge

What to expect at Mozilla Festival

Unlearning asks us to rethink the defaults that shape technology today. At Mozilla Festival 2025, we’ll set aside old assumptions and explore new ways of working so technology serves people and planet. Together we’ll imagine bold alternatives and start building them.

Meet our Headliners

On Unlearning

Plenary

Dr. Ruha Benjamin

Dr. Ruha is an enthralling storyteller, brilliant scholar, and fierce advocate for all things just. Break free from the power of digital biases and system-shaping myths. She redefines unlearning as a radical act of possibility.
Awe as an Antidote to the Grid

Plenary

Jason Silva

Jason Silva is an Emmy-nominated storyteller, filmmaker. Step outside the algorithm and experiment with unmapping the self, as he sheds inherited assumptions and reimagines unlearning as liberation.

Session Highlights

Signals ≠ Surveillance: Demystifying a Single Ad Request

Hobert Bush | Mozilla

Step through a real ad request. See how Respectful Advertising at Mozilla reduces tracking while keeping ads useful, and leave with a clear mental model plus docs to dig in.

Funding Without Funnels: A New Way to Get Paid on the Web with Web Monetization

Santosh Viswanatham | Arcesium / Interledger Foundation

Learn Web Monetization, a W3C proposal using Interledger. Add a single link to start getting paid directly in the browser without ads or lock-in.

Agentic Observability – Making LLM Apps Debuggable, Trustworthy, and Scalable

Krishna Gade & Sharath Rajasekar

Practical tools to trace agent reasoning, monitor behavior, and add runtime safeguards so LLM apps are debuggable, trustworthy, and scalable.

Tor Network Health: building a safer and stronger anonymity network

Hiro | Tor Project

See how the Tor community measures network health and tackles abuse. Learn ways to contribute relays and governance to keep anonymity strong.

The open agentic web: how protocols will power the future

Rupert Manfredi | Unternet

Agentic interfaces are reshaping the web. Explore the protocols that can preserve openness and user agency while enabling sustainable models.