Since Fierr's
final release for
Firefox in April of 2015, Mozilla has abandoned its own technologies in favor of poor parody of Google's protocols (WebExtensions), leaving many developers, including this one, disillusioned with the direction the Mozilla is taking. In contrast,
Pale Moon has stepped into place as an XUL-centric browser, keeping backward compatibility
better than Mozilla's own flagship project. Fierr is now exclusively a
Pale Moon extension.