From what I read, it is a JavaScript framework under a copyleft license with
the intention of forcing other JavaScript to be copyleft.
I don't see this gaining traction as the more popular, mature, and stable
jQuery and Mootools frameworks are under free software licenses.
LibreJS is a failure at this point and proves that there needs to be better
ways to detect JS licenses. Since Abrowser/Firefox and Chrome/Chromium
support sourcemaps, why not have an extension check minified JS code for the
sourcemap and analyze the unminified code for a license block?
