Defaults to a customizable start page in cooperation with.Always runs in single- process mode, whereas Firefox became a multi-process program.Replaces the Gecko browser engine with the Goanna fork.Supports NPAPI plugins indiscriminately, all of which are no longer supported by Firefox.Firefox no longer supports this and retains limited options for UI customization. Supports 'Complete Themes', add-ons which can customize the entire UI of the browser.Supports extensions built with XUL and XPCOM, which are no longer supported by Firefox.

Uses the pre-Australis user interface ('Strata') as carried by Firefox during versions 4-28.Pale Moon has diverged from Firefox in a number of ways: It also continues to support some types of add-ons and plugins that are no longer supported by Firefox, including NPAPI plugins such as Adobe Flash Player, as well as legacy Firefox extensions.

Pale Moon retains the highly customizable user interface of the Firefox version 4–28 era. The main differences are the user interface, add-on support, and running in single- process mode. Pale Moon originated as a fork of Firefox, but has subsequently diverged. There are official releases for Microsoft Windows, FreeBSD, macOS, and Linux, as well as contributed builds for various platforms.

Pale Moon is an open-source web browser with an emphasis on customization its motto is 'Your browser, Your way'.

Binaries: Proprietary freeware, or MPL-2.0 if branding is removed.

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