When was firefox 4.0 released

Privacy Promise Learn how Firefox treats your data with respect. Firefox Blog Read about new Firefox features and ways to stay safe online. Release Notes Get the details on the latest Firefox updates.

Facebook Container Help prevent Facebook from collecting your data outside their site. Pocket Save and discover the best stories from across the web. Mozilla VPN Get protection beyond your browser, on all your devices. Product Promise Learn how each Firefox product protects and respects your data. Please note that if you keep your profile, any version of Firefox that you install after removing Firefox 4 will continue to use the bookmarks, web browsing history, add-ons, and other data from this profile folder.

Add-ons installed with previous versions of Firefox may not yet have been updated by their authors to work with this Firefox 4. If you wish to help test Add-ons, please install the Add-on Compatibility Reporter - your favorite Add-on author will appreciate it! This list covers some of the known problems with Firefox 4 which will be resolved in future versions:. We need help from developers and the testing community to provide as much feedback as possible to make Firefox even better.

Please pick your favorite way to give us your feedback at any time! Extensions and Themes can be downloaded from Firefox Add-ons. Lots of people. A tarball of the Firefox 4 source code is available for download. The latest development code can be obtained through Mercurial. Firefox-specific source is in mozilla-central's "browser", "toolkit", and "chrome" directories. Please follow the build instructions. Firefox 4 works with whatever mail client is the default on your system.

However, we recommend Mozilla Thunderbird , our next-generation email client and the perfect complement to Firefox. Eventually you will be able to get the latest version of the Firefox 4 Beta in many languages.

For builds for other systems and languages not provided by Mozilla, see the Contributed Builds section at the end of this document. Please note that installing Firefox 4 Beta will not overwrite your existing installation of Firefox. This data is stored in your profile folder , which can be found by going to the Help menu and selecting Troubleshooting Information The button next to the Profile Directory line in Application Basics will open your profile directory in your system's file explorer.

Please note that if you keep your profile, any version of Firefox that you install after removing Firefox 4 Beta will continue to use the bookmarks, web browsing history, add-ons, and other data from this profile folder. Add-ons installed with previous versions of Firefox may not yet have been updated by their authors to work with Firefox 4 Beta.

If you wish to help test Add-ons, please install the Add-on Compatibility Reporter - your favorite Add-on author will appreciate it! This list covers some of the known problems with Firefox 4 Beta which will be resolved in future versions:. We need help from developers and the testing community to provide as much feedback as possible to make Firefox even better. Please pick your favourite way to give us your feedback at any time! Extensions and Themes can be downloaded from Firefox Add-ons.

Lots of people. A tarball of the Firefox 4 Beta source code is available for download. The latest development code can be obtained through Mercurial. Firefox-specific source is in mozilla-central's "browser", "toolkit", and "chrome" directories. Please follow the build instructions. Firefox 4 Beta works with whatever mail client is the default on your system. Mozilla, a global, nonprofit organization dedicated to making the Web better, is proud to release Mozilla Firefox 4, the newest version of the popular, free and open source Web browser.

Firefox puts users in control of their Web experience, providing a streamlined user interface, fun new features, a boost in speed and support for modern Web technologies.

Firefox 4 will also be available on Android and Maemo devices soon. Firefox 4 is the fastest Firefox yet. With dramatic speed and performance advancements across the board, Firefox is between two and six times faster than previous releases.

Major enhancements to the JavaScript engine make everything from startup time to page load speed to graphics and JavaScript performance screaming fast in Firefox.