Gecko is the name of the layout engine developed by the Mozilla Project. It was originally named NGLayout.

Gecko's function is to read web content, such as HTML, CSS, XUL, JavaScript, and render it on user's screen or print it. In XUL-based applications Gecko is used to render the application's user interface as well.

Gecko is used in many applications, including a few browsers, such as Firefox, SeaMonkey, Camino, etc. (for a complete list, please refer to Wikipedia's article on Gecko.) Products using the same version of Gecko have identical support for standards.

Versions of Gecko

Gecko version Applications based on it
Gecko 11 Firefox 11.0, Thunderbird 11, SeaMonkey 2.8
Gecko 10 Firefox 10, Thunderbird 10, SeaMonkey 2.7
Gecko 9 Firefox 9, Thunderbird 9, SeaMonkey 2.6
Gecko 8 Firefox 8, Thunderbird 8, SeaMonkey 2.5
Gecko 7 Firefox 7, Thunderbird 7, SeaMonkey 2.4
Gecko 6 Firefox 6, Thunderbird 6, SeaMonkey 2.3
Gecko 5 Firefox 5, Thunderbird 5, SeaMonkey 2.2
Gecko 2 Firefox 4, Thunderbird 3.3, SeaMonkey 2.1
Gecko 1.9.2 Firefox 3.6, Thunderbird 3.1
Gecko 1.9.1 Firefox 3.5, Thunderbird 3, SeaMonkey 2.0
Gecko 1.9 Firefox 3
Gecko 1.8.1 Firefox 2, Thunderbird 2, SeaMonkey 1.1
Gecko 1.8 Firefox 1.5, Thunderbird 1.5, SeaMonkey 1.0
Gecko 1.7 Firefox 1.0, Thunderbird 1.0, Nvu 1.0, Mozilla Suite 1.7
older versions of Gecko match the Mozilla Suite versions


Gecko FAQ
Frequently asked questions about Gecko.
Gecko DOM reference
Reference to the DOM.
Gecko event reference
Reference to events used within Gecko and Mozilla applications; for web-standard DOM events, see the DOM event reference.
Introduction to Layout in Mozilla
Tech Talk on layout.
Embedding Mozilla
Using Gecko in your own application.
Character sets supported by Gecko
A list of the character sets supported by Gecko.
HTML parser threading
Description of multithreading in the HTML parser.
Gecko Home Page on MozillaWiki
Home for the active developers. Roadmaps and more up-to-date resources.

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