Pale Moon: Technical Details

So, you want more details about the browser? I'll be more than happy to explain:

Features/disabled features

This browser aims to strike a balance between features and speed/resource use. As such, a choice has been made to consciously disable a few features found in other browsers that are not commonly used by the largest group of users. If you require any of the disabled features, then the main-line build of Pale Moon is not for you! You may find a suitable version on the third party contributed builds page instead.

The Pale Moon browser has, among other things, the following features:
  • Optimized for current processors.This browser will not run on particularly old systems.
  • Increased stability: experience fewer crashes.
  • Support for Scalable Vector Graphics (SVG) and Canvas drawing.
  • Compatibility with many Legacy Firefox Extensions (add-ons) although we do not provide support for them unless actively supported in our community.
  • Offering low-level API access to extension developers to truly extend browser features.
  • Support for Personas ("lightweight" themes).
  • Support for Complete Themes.
  • CSS Downloadable Font support (including WOFF and WOFF2).
  • Extended HTML5, CSS3 and advanced DOM support.
  • Full and ongoing support for NPAPI plugins (Java, Silverlight, etc.)
  • Speedy scripting and page rendering.
  • Superior gradients and fonts.
  • Optimized, secure networking.
  • Graphical tab switching with quick-search (user-selectable).
  • More customization options for navigation controls and the tab strip than other modern browsers.
  • Enhanced security indicators (padlock/styling/domain/IDN display).
  • More options for recovery (safe mode dialog with various options).
The following features have been disabled or removed by design:
  • Accessibility features. Most people don't have a need for specialized accessibility features for custom input or display devices. This cuts down on the input complexity, and increases speed, but will, obviously, not be suitable for people who need these features.
  • Parental controls. Pale Moon aims to be a fast browser for general use, not a "secured family browser". The design impact of operating system integrated parental controls as introduced in Mozilla code is significant, and has had serious implications for building the browser. As such, parental controls have been disabled. Extensions-based parental controls are, of course, a just-as viable alternative (and may in many cases work better!).
  • WebRTC. Apart from opening up a whole can of worms security/privacy-wise, "Web Real Time Chat" (comparable with Skype video calls and the likes) is not considered useful or desired functionality for Pale Moon (both according to the developers and the users of the browser at large). This is best left to dedicated programs or at most a browser plug-in.
  • Maintenance service. Pale Moon does not use a Windows maintenance service and does not update silently in the background.
  • Integrated PDF reader. You are always recommended to use a separate, up-to-date document reader for PDF files (as an external program, not as a browser plugin) for your own security, and to have documents displayed in their fully intended format instead of a stripped-down display in an in-browser reader.
  • Tab Groups. The Tab Group (aka Panorama) feature has never properly matured and has not seen many people using it. In addition, the feature is generally slow to use, not intuitive, and puts a rather hefty load on the browser when included. For people who still prefer to use this feature even though it has been completely removed from the browser, an add-on is available to replace the removed code.
  • In-browser DRM. Digital Rights Management using "black box" content-decryption modules to serve a self-imposed DRM-encumbered media market that punishes the wrong parties has no place in Pale Moon. If you wish to use such media, you can use plugins with DRM features like Microsoft Silverlight.

Supported processors

The Pale Moon browser is specifically optimized for relatively-recent processors and uses instructions exclusively available in more modern (or rather: not museum-grade) processors. This means it will not run on PCs that are particularly old by today's standards, and is likely to display errors or refuse to start on systems with unsupported or poorly supported CPUs. Even if you meet the minimum CPU requirements for the browser, you should not expect wonders from your hardware if it is dated. Modern web browsers are very much alike full-fledged 3D games in the resources and processing power/graphics power they require.
Requirements for the regular Pale Moon browser are, in short: a CPU with SSE2 support. This support has been present in all mainstream CPUs since the Intel Pentium 4, and the AMD Athlon64 processors. All multi-core processors on the market should support this instruction set.

How different is this browser from Mozilla products?

The differences are increasingly significant as time passes. Pale Moon should be considered a "true fork" and a totally independent product.
  1. Pale Moon is based on a derivative of the Gecko rendering engine (Goanna) and builds on a hard fork of the Mozilla code (mozilla-central) called GRE, a XUL-focused application platform that provides the underpinnings of several XUL applications including Pale Moon. This means that the core rendering functions for Pale Moon may differ from Firefox (and other browsers) and websites may display slightly different in this browser.
  2. Pale Moon comes with a number of different configuration settings and under-the-hood behaviour than Firefox, and may behave differently when certain advanced configuration preferences are changed. Never assume that what applies to Firefox also applies to Pale Moon. in many cases it does not.
    Note that "internet speed boosters" and general "tweak guides" written for Firefox can actually harm Pale Moon's speed as the configuration defaults are made with in-depth knowledge of the browser back-end and "a higher number" or "bigger buffer" isn't always better. You are strongly advised to always use defaults as supplied in Pale Moon.
  3. Changes were made to the user interface and feature set, to incorporate functionality and visual elements in different locations than what was chosen by the Mozilla team, as well as retaining or re-introducing useful elements that were removed in Firefox, and either removing or disabling (by default) components that would not be used by the average user. In addition, some other user interface changes were made to provide an as consistent and intuitive interface as possible while still staying close to what Firefox's goals have always been. This means the "Australis" or "Photon" interfaces will never be used in Pale Moon.
  4. Pale Moon offers more configurability for features, like additional tab preferences, preferences for image loading or tab positions, additional security preferences, and full control over smooth scrolling, to name a few.
  5. Pale Moon uses a different "Sync" client and its own server to synchronize data between different instances of the browser. This is not compatible with Firefox Sync as used in Firefox 29 or later. Mozilla's change to "Firefox Accounts" is a different and less secure approach to synchronizing data and focuses more on future commercial endeavours and services of the Mozilla Corporation and, after careful consideration, has been rejected for use in Pale Moon (for quite the list of reasons, to be fair).

How Pale Moon has been tested

Pale Moon builds are tested for stability before being released by having it used for day-to-day browsing. Of course, specific functional changes are always tested when they are implemented during development.

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