Apps with 'Support for Firefox extensions' feature

Mozilla Firefox (known simply as Firefox) is a free and open source web browser descended from the Mozilla Application Suite.

Waterfox is a high performance browser based on the Mozilla platform. Made specifically for 64-bit systems, Waterfox has one thing in mind: speed.

Pale Moon is an Open Source, Goanna-based web browser available for Microsoft Windows and Linux focusing on efficiency and ease of use.

The SeaMonkey project is a community effort to develop the SeaMonkey all-in-one internet application suite. A lighter alternative to Mozilla Firefox.

Basilisk is a free and Open Source XUL-based web browser, featuring the well-known Firefox-style interface and operation.

Historically, Iceweasel was a re-branding of Mozilla Firefox by the Debian project, with minimal modifications, in order to resolve branding disputes.