Pale Moon is a fast and stable Open Source alternative to the standard Firefox browser.
It is essentially an optimized version of Mozilla's browser that retains Firefox's stability and reliability while providing a familiar, efficient, and fully customizable interface. It supports most of the Firefox add-ons and themes that you have come to enjoy as well as many that are native to Pale Moon itself.
The developers decided that several features needed to be eliminated to keep the browser running fast, such as accessibility features and parental controls. It is also essential to point out that this browser doesn't contain Adobe Flash Player, which will be needed when viewing some websites; this will require you to install it separately.
Pale Moon is optimized for modern processors, safe, and is supported by a friendly, active community of users. Other support includes full themes and easily-created lightweight themes. Some additional features include fast page drawing and script processing, increased stability, Firefox, and Pale Moon extensions, support for HTML5 and CSS3, and many configuration options.
Pale Moon is also able to import existing Firefox profiles with the migration tool.