Welcome Mozilla Developer Preview (1.9.3 alpha)
Congratulations! You are running the Mozilla Developer Preview, an alpha release for early testing of future Firefox features. Mozilla needs your help to test new features and find problems with our products. Helping out won't take much of your time, doesn't require special skills, and will help make the next version of Firefox even better.
How You Can Help
- Test Your Plugins
- If you have plugins installed, please test pages which use plugin features. For more details, see the out-of-process plugin testing page.
- Test Secure Websites
- Please test any secure websites you use, such as bank websites. We are especially interested in problems that may occur with client certificates or other unusual SSL configurations.
- Submit crash reports
- Please submit crash reports when prompted by the Crash Reporter. The Crash Reporter reports give us valuable data on which crashes are the most common and serious. A comment detailing what you were doing at the time of the crash is especially helpful.
- Join the QA Team
- Mozilla QA has a page dedicated to ways to get involved with helping. You don't have to be technical and being involved is good for people wanting to get more familiar with Mozilla and Firefox to contribute to the project. Get Involved!
- Report Problems
- Found a problem in the Mozilla Developer Preview? Start a discussion in the Mozilla discussion groups, or file a bug report in Mozilla's bug tracking system.
Known Issues
- Add-ons
- Add-ons installed under previous versions of Firefox may be incompatible with the Mozilla Developer Preview of Gecko 1.9.3 Alpha.
See the Release Notes for other known issues
Note: The Mozilla Developer Preview build you are using is NOT A FINAL VERSION of Firefox, it has been made available for testing purposes only, with no end-user support. If that sounds scary, you'd probably be better off with the latest version of Firefox that you can download here.
Featured Changes
- On Windows and Linux, plugins (such as Flash and Silverlight) are now isolated from Firefox. Plugin crashes will not kill Firefox itself, and unresponsive plugins are automatically restarted.
- The SSL security system has been changed to fix a renegotiation flaw. For technical details, see the newsgroup posting announcing the change.
- Crash reports from plugin processes are now submitted automatically. Crash report submission can be disabled in Firefox preferences (Advanced / General / Submit crash reports).
See the release notes for a complete list of features.