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Experimental web browser from Mozilla

Project Tofino

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Project Tofino is a browser interaction experiment.

The kinds of things we use browsers for on PCs and mobile devices are different than they were when the current "tabs across the top" browsers were designed. We believe we can do a lot better by focusing on the tasks and activities users engage browsers for. Project Tofino is one of our explorations.

This project is extremely immature. It's currently at the "OK, lets throw some stuff together to see what happens" stage. Please adjust your expectations accordingly. The tools we're using are not a statement on the set of technologies we'll use to build a final product if these ideas pan out. We're looking for the quickest way to build the experiments we want, not a long-term technical strategy.

If you like a wild ride and you've got another browser for real work, we'd love to have your comments on what works and what doesn't. But right now the "what works" list is a lot shorter than the "what doesn't" list, so maybe check back in a few weeks when there's more to look at.

We blog here:

We hang out on Slack here: (you can get an invite at


Documentation for building is found in docs/


  • npm start - Runs the build in production mode. Should be similar to a packaged build.
  • npm run dev - Runs the build in development mode with hot module reloading.
  • npm run package - Creates a distributable package.
  • npm run clobber - Destroys a handful of temporary files (electron build, node modules, configurations) to clean up invalid states. If running into strange issues, try this command, followed by an npm install.

Even though the user agent and content services are reused between multiple browser instances, they don't outlive their parent process by default when it exits, to ease development. To have them kept alive even when there are no more clients left, npm run serve will start these services standalone for finer lifetime control.


Currently runs linting, unit and webdriver tests with mocha.

npm test


Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

See for further notes.

This project is very new, so we'll probably revise these guidelines. Please comment on a bug before putting significant effort in if you'd like to contribute.

The code uses examples from many different places, but the foundation was started from a set of posts from Paul Frazee:


This software is licensed under the Apache License Version 2. See LICENSE for details.


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