Firefox 3 "Aero" theme for Pale Moon. Initially forked from the theme [Firefox 3 theme for Firefox 4+ Reloaded!] (https://addons.mozilla.org/en-US/firefox/addon/firefox-3-theme-for-firefox-1/) by dallasthemaster and Jeremy Morton.
Simply download the contents of the "src" folder and pack the contents into a .zip file. Then, rename the file to .xpi and drag into the browser.
You can grab the latest release either from the Releases section of this repository, or the Pale Moon Add-Ons Site.