Firefox

Firefox is a free open source web (and file) browser developed by the Mozilla Foundation. Versions are available for Android, Chrome OS, iOS, Linux, macOS, and Windows. Extensions or themes can be developed and integrated into the application according to the user's preferences.

History
After Netscape was acquired by AOL, the Netscape Navigator browser was discontinued and the source code was released to the Mozilla Organization, which began development of Firefox under the codename Phoenix in 2002. The first public beta, codenamed "Pescadero", was seeded on September 23, 2002. Version 1.0 for Mac OS X, Linux, and Windows 98 to XP was released on November 9, 2004. PowerPC support was dropped during the beta development cycler of version 4.0 in 2010, leading to the of the TenFourFox browser for legacy Mac users.

Plug-ins such as Flash Player were deemed a security issue and deprecated in 2017, then phased out by the end of 2020.

System requirements
As of May 2022, the minimum requirements are:
 * iOS 13 or later
 * iPadOS 13 or later
 * macOS 10.12 (Sierra) or later
 * (some older versions can be installed, but may not offer the same level of security)

Forks

 * Arctic Fox, a fork of Firefox for Mac OS X 10.6 (Snow Leopard)
 * TenFourFox, a fork of Firefox for Mac OS X 10.4 (Tiger)
 * InterWeb, forks of Firefox for obsolete PowerPC or 32-bit Intel Macs.
 * Classilla, a fork of Mozilla for Mac OS 9