The non-profit behind Firefox and MDN Web Docs — a guardian of an open, standards-based web.
Official siteMozilla is a non-profit and its affiliated corporation that champions an open, private and interoperable web. It is best known for the Firefox browser and for MDN Web Docs, the reference documentation web developers rely on every day.
Mozilla does not run a search engine or an ad auction, but its influence is real: Firefox keeps the browser market from becoming a monoculture, and MDN is a de facto standard for how developers learn and implement the web platform correctly.
Mozilla develops Firefox and the Gecko rendering engine, maintains MDN Web Docs, and advocates for privacy, open standards and a healthy internet. It participates in the standards process that shapes what browsers support.
Because Firefox is a distinct browser and engine, testing against it helps catch rendering and compatibility issues that a Chromium-only workflow would miss. MDN is also the practical source of truth we and most developers use to build to spec correctly.
We build cross-browser and test against Firefox alongside Chromium browsers so sites render and perform consistently, and we lean on MDN as the reference for implementing web-platform features correctly — both of which keep technical SEO and user experience solid.
Common questions
Straight answers on how this fits your marketing and build.
Yes. Firefox uses the independent Gecko engine, so it can surface rendering, layout and compatibility issues that Chromium-based browsers hide. Testing against it protects user experience and prevents subtle bugs that hurt engagement.
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