| First appeared | 1999 |
|---|---|
| Developer | Mozilla Foundation |
| Type | XML-based format, file format, user interface markup language, programming language |
| Influenced by | HTML, XML |
| License | Mozilla Public License |
| File extensions | xul |
| Website | developer.mozilla.org |
| Written in | C++ |
| Operating systems | cross-platform |
Sources: Wikidata (CC0) · Wikidata Q726218