Firefoxspecific

Firefoxspecific is a term used to describe features, APIs, or behaviors that are unique to Mozilla Firefox and not part of web standards or implemented in the same way in other browsers. It covers areas of the browser itself, as well as features exposed to web content and extensions.

Firefoxspecific elements have appeared in various forms over the years. In the web content space, older CSS and JavaScript capabilities were exposed with Gecko-specific prefixes or behaviors that did not become standard. On the UI or extension side, Firefox historically used XUL-based interfaces and XPCOM components, and extensions could rely on Firefoxspecific APIs. Since the move to WebExtensions and standard web technologies, many of these web-facing Firefoxspecific features have been deprecated or removed, though some Firefox-only tools remain in the browser's user interface and developer tools.

In practice, Firefoxspecific content is generally avoided for production sites intended to run in multiple browsers. Developers are advised to rely on web standards and progressive enhancement, using feature detection rather than browser-specific APIs. For extension development, Firefox WebExtensions enable cross-browser compatibility, while certain legacy Firefoxspecific APIs exist but are no longer recommended for new add-ons.

See also: Gecko, WebExtensions, browser compatibility, Firefox developer tools.