Credits and source code

The Ultimity browser is built on Mozilla Firefox ESR, which Mozilla publishes under the Mozilla Public License 2.0. Ultimity does not change Mozilla's files. It adds its own branding, settings and a built-in workspace, and builds with its own options.

Source code

Every Ultimity browser release lists the exact Firefox source it was built from, on Mozilla's release archive, and the Ultimity overlay that was applied to it: source for each release.

Other open-source software

Ultimity also includes open-source packages under the MIT, Apache 2.0, BSD, ISC and similar licences. Their licence notices ship with the app.

Trademarks

Mozilla and Firefox are trademarks of the Mozilla Foundation. Ultimity is not affiliated with or endorsed by Mozilla.