Mozilla Firefox is a free, open-source web browser available for Windows, Mac, and Linux. It was developed by the Mozilla Corporation, and is considered a spiritual successor to Netscape Navigator. It uses the Gecko layout engine. Once the most popular web browser online, Firefox has been surpassed by Google Chrome in recent years, though it is still the most popular web browser in certain areas of the world.
Definition #2 for "mozilla firefox"
Mozilla Firefox (or simply Firefox) is a free and open-source web browser developed by Mozilla Foundation and its subsidiary, Mozilla Corporation. Firefox is available for Windows, macOS and Linux... wikipedia.org