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.For example, if you need accessibility features or parental controls, then please visit the Firefox homepage and get the official, non-optimized version of the browser. Please see the page with technical details to learn exactly what the browser supports, and what it doesn't support. A few carefully selected features have been disabled that are not in high demand, and that do not interfere with the way web pages are displayed or function all to maximize the efficiency of the browser.

This browser, even though close to Firefox in the way it works, offers a different set of features than its sibling.

Pale Moon offers you a browsing experience in a browser completely built from source with carefully selected features and optimizations to maximize the browser's speed*, stability and user experience, while maintaining compatibility with the thousands of Firefox extensions you have come to love and rely on. Make sure to get the most out of your browser! Pale Moon is an Open Source, Firefox-based web browser for Microsoft Windows, focusing on efficiency and ease of use.

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