Firefox 3 Release Notes
v3.0.16, released December 15th, 2009 Check out what’s new, the known issues and frequently asked questions about the latest version of Firefox. As always, you’re encouraged to tell us what you think, either using this feedback form or by filing a bug in Bugzilla.
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What’s New in Firefox 3.0.16
Firefox 3.0.16 fixes several issues found in Firefox 3.0.15:
- Fixed several security issues.
- Fixed several stability issues.
- See the Firefox 3.0.15 release notes for changes in previous releases.
See the complete list of bugs fixed.
Please note that while the 32-bit and 64-bit versions of Windows Vista and Windows 7 can be used to run Firefox 16, only 32-bit builds of Firefox 16 are supported at this time. Recommended Hardware Pentium 4 or newer processor that supports SSE2 512MB of RAM.
System Requirements
Before installing, make sure your computer meets the system requirements.
Downloading
Mozilla provides Firefox 3 for Windows, Linux, and Mac OS X in a variety of languages. You can get the latest version of Firefox 3 here. For builds for other systems and languages not provided by Mozilla.org, see the Contributed Builds section at the end of this document.
Installing
Please note that installing Firefox 3 will overwrite your existing installation of Firefox. You won’t lose any of your bookmarks or browsing history, but some of your extensions and other add-ons might not work until updates for them are made available.
Uninstalling
You can remove Firefox 3 through the Control Panel in the Start Menu on Windows, by removing the Firefox application on OS X, or by removing the firefox folder on Linux.
Removing Firefox 3 won’t remove your bookmarks, web browsing history, extensions or other add-ons. This data is stored in your profile folder, which is located in one of the following locations depending on your operating system:

| Windows Vista | Users<UserName>AppDataRoamingMozillaFirefox |
| Windows 2000, XP, Server 2003 | Documents and Settings<UserName>Application DataMozillaFirefox |
| Mac OS X | ~/Library/Application Support/Firefox |
| Linux and Unix systems | ~/.mozilla/firefox |
Any version of Firefox that you install after removing Firefox 3 will continue to use the data from this profile folder.
Extensions and Themes
Extensions installed under Firefox 2 may be incompatible and/or require updates to work with Firefox 3. Please report any issues to the maintainer of the extension. When you install Firefox 3 all of your Extensions and Themes will be disabled until Firefox 3 determines that either a) they are compatible with the Firefox 3 release or b) there are newer versions available that are compatible.
Known Issues
This list covers some of the known problems with Firefox 3. Please read this before reporting any new bugs.
- If Flash content is active when Firefox crashes, the Crash Reporter may not activate (bug 422308). This issue is fixed in Flash 10.
- Deleting an entry from the history sidebar, then invoking the Clear Private Data tool can result Firefox crashing (bug 426275)
- Some add-ons that depend on deprecated code may not install properly (see bug 406807)
- Privacy > History > Remember visited pages to '0' has no effect (bug 366075)
- Some Web pages (such as mlb.com) do not properly detect if Silverlight is installed and will not function properly (bug 432371) This issue is fixed by the Silverlight 2.0 beta.
- The DOM Inspector has been removed and is now available as an add-on.
- Support for Cross-Site XmlHttpRequest has been removed until the specification becomes more stable and the security model is improved (bug 424923)
- After dismissing the 'Do you want Firefox to remember this password' prompt, it is sometimes not possible to focus form fields unless you reload the page (bug 433942)
- The new Location Bar, Add Bookmark dialog, and Download Manager information popup behave inconsistently with Window-Eyes (bug 393398). This is fixed in an upcoming Window-Eyes release.
- A Windows Media Player (WMP) plugin is not provided with Windows Vista and some other versions of Windows. To view Windows Media content, you must install this plugin by following these instructions. After installing you may need to check for Windows Updates before the plugin will show content properly.
- Users who have older installations of Google Desktop Search may experience crashes on startup; reinstalling Google Desktop Search fixes the problem (bug 401513)
- If you are using IPv6 from a network location that doesn't support IPv6 routing your DNS lookups may be very slow. Set network.dns.disableIPv6 to true as a workaround (bug 417689)
- Users running Ubuntu 7.10 may need to update their certificate databases in order to submit crash reports (bug 407748 for instructions)
- The mouse button assignments for Back and Forward have changed, users may need to reconfigure their pointing devices (bug 420294)
- Incompatibilities between NVIDIA drivers and some versions of the X server cause scaled images to render incorrectly (bug 411831)
- The Orca screen reading software does not read some text, such as the save password notification, site identity information, or the default prompt text in search fields - these are known problems with Orca (see Gnome bug 533109 and 533125). This issue will be fixed in an upcoming Orca release.
Troubleshooting
- Poorly designed or incompatible extensions can cause problems with your browser, including make it crash, slow down page display, etc. If you encounter strange problems relating to parts of the browser no longer working, the browser not starting, windows with strange or distorted appearance, degraded performance, etc, you may be suffering from Extension or Theme trouble. Restart the browser in Safe Mode. On Windows, start using the 'Safe Mode' shortcut created in your Start menu or by running
firefox.exe -safe-mode. On Linux, start with./firefox -safe-modeand on Mac OS X, run:
When started in Safe Mode all extensions are disabled and the Default theme is used. Disable the Extension/Theme that is causing trouble and then start normally.cd /Applications/Firefox.app/Contents/MacOS/
./firefox-bin -safe-mode - If you uninstall an extension that is installed with your user profile (i.e. you installed it from a Web page) and then wish to install it for all user profiles using the -install-global-extension command line flag, you must restart the browser once to cleanse the profile extensions datasource of traces of that extension before installing with the switch. If you do not do this you may end up with a jammed entry in the Extensions list and will be unable to install the extension globally.
- If you encounter strange problems relating to bookmarks, downloads, window placement, toolbars, history, or other settings, it is recommended that you try creating a new profile and attempting to reproduce the problem before filing bugs. Create a new profile by running Firefox with the -P command line argument, choose the 'Manage Profiles' button and then choose 'Create Profile...'. Migrate your settings files (Bookmarks, Saved Passwords, etc) over one by one, checking each time to see if the problems resurface. If you do find a particular profile data file is causing a problem, file a bug and attach the file.
Frequently Asked Questions
- What can I do to help?
We need help from developers and the testing community to provide as much feedback as possible to make Firefox even better. Please read these notes and the bug filing instructions before reporting any bugs to Bugzilla. You can also give us your feedback through this feedback form.
- Where can I get extensions and themes (add-ons)?
Extensions and Themes can be downloaded from Firefox Add-ons.
- Who makes Firefox 3?
Lots of people. See Help->About Mozilla Firefox, Credits for a list of some of the people who have contributed to Firefox 3.
- Where’s the Firefox 3 source code?
A tarball of the Firefox 3 source code is available for download. The latest development code can be obtained by cvs. Firefox-specific source is in 'mozilla/browser', 'mozilla/toolkit', and 'mozilla/chrome'. Please follow the build instructions.
- Where is the mail client?
Firefox 3 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.
Contributed Builds
These are unofficial builds and may be configured differently than the official Mozilla builds. They may also be optimized and/or tested for specific platforms. You can browse through the available contributed builds on the FTP site.
Other Resources and Links
The following resources contain useful information about Firefox 3:
- SafeBrowsing Service Privacy Policy (for anti-phishing/anti-malware feature)
A faster, more secure and customizable Web browser.
Mozilla Firefox (64-bit) - Mozilla Firefox is a fast, light and tidy open source web browser. At its public launch in 2004 Mozilla Firefox was the first browser to challenge Microsoft Internet Explorer’s dominance. Since then, Mozilla Firefox has consistently featured in the top 3 most popular browsers globally and this is set to continue thanks to the release of Firefox 30. The key features that have made Mozilla Firefox so popular are the simple and effective UI, browser speed and strong security capabilities. The browser is particularly popular with developers thanks to its open source development and active community of advanced users.
Easier Browsing
Mozilla put of a lot of resources into creating a simple but effective UI aimed at making browsing quicker and easier. They created the tab structure that has been adopted by most other browsers. In recent years Mozilla has also focused on maximizing browsing area by simplifying toolbar controls to just a Firefox button (which contains settings and options) and back/forward buttons. The URL box features direct Google searching as well as an auto predict/history feature called Awesome Bar. On the right side of the URL box there are bookmarking, history and refresh buttons. To the right of the URL box is a search box which allows you to customize your search engine options. Outside of that a view button controls what you see below the URL. Next to that you have the download history and home buttons.
Speed
Mozilla Firefox boasts impressive page load speeds thanks to the excellent JagerMonkey JavaScript engine. Start up speed and graphics rendering are also among the quickest in the market. Firefox manages complex video and web content using layer-based Direct2D and Driect3D graphics systems. Crash protection ensures only the plugin causing the issue stops working, not the rest of the content being browsed. Reloading the page restarts any affected plugins. The tab system and Awesome Bar have been streamlined to launch/get results very quickly too.
Security


Firefox was the first browser to introduce a private browsing feature which allows you to use the internet more anonymously and securely. History, searches, passwords, downloads, cookies and cached content are all removed on shutdown. Minimizing the chances of another user stealing your identity or finding confidential information. Content security, anti-phishing technology and antivirus/antimalware integration ensures your browsing experience is as safe as possible.
Personalisation & Development
One of the best features of the Firefox UI is customization. Simply right click on the navigation toolbar to customize individual components or just drag and drop items you want to move around. The inbuilt Firefox Add-ons Manager allows you to discover and install add-ons within the browser as well as view ratings, recommendations and descriptions. Read about the top recommended add-ons for Mozilla Firefox on TechBeat. Thousands of customizable themes allow you to customize the look and feel of your browser. Site authors and developers can create advanced content and applications using Mozilla’s open source platform and enhanced API.
- Firefox keeps getting faster as a result of significant updates to SpiderMonkey, our JavaScript engine, you will now experience improved page load performance by up to 15%, page responsiveness by up to 12%, and reduced memory usage by up to 8%. We have replaced part of the JavaScript engine that helps to compile and display websites for you, improving security and maintainability of the engine at the same time.
- Firefox introduces HTTPS-Only Mode. When enabled, this new mode ensures that every connection Firefox makes to the web is secure and alerts you when a secure connection is not available. You can enable it in Firefox Preferences.
- Pinch zooming will now be supported for our users with Windows touchscreen devices and touchpads on Mac devices. Firefox users may now use pinch to zoom on touch-capable devices to zoom in and out of webpages.
- Picture-in-Picture now supports keyboard shortcuts for fast forwarding and rewinding videos: use the arrow keys to move forward and back 15 seconds, along with volume controls.
- When you are presenting your screen on a video conference in Firefox, you will see our improved user interface that makes it clearer which devices or displays are being shared.
- Firefox supports AcroForm, which will allow you to fill in, print, and save supported PDF forms and the PDF viewer also has a new fresh look.
- Selecting a search engine at the bottom of the search panel now enters search mode for that engine, allowing you to see suggestions (if available) for your search terms. The old behavior (immediately performing a search) is available with a shift-click.
- When Firefox autocompletes the URL of one of your search engines, you can now search with that engine directly in the address bar by selecting the shortcut in the address bar results.
- We have added buttons at the bottom of the search panel to allow you to search your bookmarks, open tabs, and history.
- Our users in India on the English build of Firefox will now see Pocket recommendations in their new tab featuring some of the best stories on the web.

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