File:Mozillagecko-logo.svg · Wikimedia Commons · See Wikimedia Commons
Gecko
Sign in to saveAlso known as Gecko engine, Gecko rendering engine, Firefox Gecko, Mozilla Gecko
free HTML layout engine
Key facts
- Original author
- Netscape
- Developers
- Mozilla Foundation , Mozilla Corporation , Adobe Systems , and other contributors
- Initial release
- 1998 as NGLayout
- Stable release
- 125 / 16 February 2026 ; 3 months ago ( 16 February 2026 )
- Written in
- C++ , JavaScript , Rust
- Type
- Browser engine
- License
- MPL 2.0
- Website
- developer .mozilla .org /en-US /docs /Glossary /Gecko
- Repository
- hg .mozilla .org /mozilla-central /
via Wikipedia infobox
Official website
Gecko - Glossary | MDN
Gecko is the layout engine developed by the Mozilla Project and used in many apps/devices, including Firefox and Firefox OS.
developer.mozilla.org →Link to the official site · 2,863 chars · not written by Vinony
Wikidata facts
- Official website
- developer.mozilla.org/ru/docs/Glossary/Gecko
Show 5 more facts
- software version identifier
- 147.0.4
- described at URL
- firefox-source-docs.mozilla.org/overview/gecko.html
- source code repository URL
- hg.mozilla.org/mozilla-central
- inception
- 1998-00-00
- Stack Exchange tag
- stackoverflow.com/tags/gecko
via Wikidata · CC0
~13 min read
Article
Gecko is a browser engine developed by Mozilla. It is used in the Firefox browser, the Thunderbird email client, and in a discontinued state on AOL's Netscape 6, Netscape 7, Netscape Browser and Netscape Navigator 9; this is alongside many other projects.
Gecko is designed to support open Internet standards, and is used by different applications to display web pages and, in some cases, an application's user interface itself (by rendering XUL). Gecko offers a rich programming API that makes it suitable for a wide variety of roles in Internet-enabled applications, such as web browsers, content presentation, and client/server.