The Mozilla, Gecko and XUL environment

The environment of XUL is made of Gecko, Firefox and XULRunner.

Firefox: web browser, run applications whose interface is written in XUL language, but can go beyond, including the Prism edition that puts web applications on the desktop.
Gecko is the HTML display engine, it partially supports HTML 5.
XULRunner is the interpreter of XUL code, it is integrated into Firefox to present its own interface, which is itself written in XUL, but also the interface of Web or local applications. If they work in both cases in Firefox, local applications can also run standalone with XULRunner.

Firefox

The main stages of the evolution of the browser.

Firefox 4
More oriented toward Web applications, it extends HTML 5 and SVG support.Firefox 3.6
A quicker startup and a more responsiveness interface.
Firefox 3.5
The new browser has a better support to HTML 5, Ajax and implements new features in CSS and DOM.
Firefox 3
New features of the browser. Analyzing support for offline applications.

Extensions for programmers and webmasters.
The main purpose is to display the status of exchange between the browser and the server, and editing JavaScript, CSS.

Cloudlet, a wizard for Google.
Adds a tag cloud to search results. Very useful.
Firefox 2 extensions contest, the winners
The jury that included James Jesse Garrett have selected 15 extensions.
See also the Firefox extensions to improve user experience.

Prefetch with Firefox, when the user reads a page, Firefox silently load another!

Boot to Gecko, the web without Windows
Mozilla wants to inspire Web browser publishers to allow to make more complete applications.

Immersive applications with XUL?
XUL can it enjoy the fresh start of the Metro interface on Windows 8, to provide an alternative to Microsoft?

What is Chromeless
Web applications on the desktop. It replace also Prism, a launcher for Web applications on the desktop.

Chromeless or Chrome?
Comparison of the two tools, which one is best suited to run web applications locally?

Why use Seamonkey?
The Internet suite is comprised of all main Web tools and includes an HTML editor.

The Spicebird communication suite
Email, chat, calendar, task can communicate and exchange data.

Flock, social browser and blog editor (now abandoned)
It was a tool for the social Web and for feed management and blog editing.