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How to Fix the JavaScript Vulnerability in Firefox 3.5

Sierra Monica B. — Wed, 15 Jul 2009 08:20:43 +0000

Yesterday, the Mozilla Security Blog posted information on a critical JavaScript vulnerability discovered by Zbyte in the latest Firefox web browser version, 3.5.
Lucas Kruijswijk found a solution for this issue and explained how you can fix it temporary, until you’ll have the possibility to download and install future updates for the web browser.

According to the blog, the bug was discovered last week in the browser’s Just-in-time JavaScript compiler and it’s considered to be a critical type vulnerability used for executing malicious code. It can be exploited by an attacker and you could be tricked to view a malicious web page with the exploit code.

In order to fix this vulnerability you need to follow a few simple steps and disable the Just-in-time in the JavaScript engine.
First you have to enter “about:config” in the address bar in Firefox 3.5. You will then see the following message: “This might void your warranty! Changing these advanced settings can be harmful to the stability, security, and performance of this application. You should only continue if you are sure of what you are doing.” Just press the “I’ll be careful, I promise!” button. Now, in the Filter box, just type “jit” and see the two results under the Preference Namesection in the left. Double-click the “javascript.options.jit.content” and make sure the settings changed to “user set” for the Status and “false” under Value. That’s it.

Another way you can disable the JIT is by running the web browser in Safe Mode.

You are now safe, but the JavaScript performance is decreased, so after receiving the security update that fixes this issue you should restore the settings.

Firefox 3.5 Final Available Today

Sierra Monica B. — Tue, 30 Jun 2009 07:50:24 +0000

Finally we can announce you that the newest version of the most popular web browser will be available for download later today.
According to Softpedia, the development of the open-source browser’s latest version was finalized yesterday and Mozilla will make it available for download within the next hours via automatic updates, for those already using previous versions, and on the official website.
Those of you who can’t wait to receive the update can spend some time to read about the new features of the browser in the following lines, just to know what to expect from it.

Firefox 3.5 was at first named Firefox 3.1, but later the name was changed and codenamed Shiretoko. It comes in over 70 languages with highest speeds ever enabled by a Firefox version, a Private Browsing Mode, the new TraceMonkey JavaScript engine, Location Aware Browsing, support for JSON, enhancements in the Gecko layout engine, support for HTML 5 video and audio, downloadable fonts, new CSS properties, JavaScript query selectors, SVG transforms and many, many other improvements.

For normal users like you and me these features translate into websites loading much faster, complex site performing more things, as well as the possibility to keep your browsing data private without recording any cookie or website you visited, these being destroyed as you exit this mode. You can enter this mode by accessing Tools -> Start Private Browsing.
In the same menu you can select Clear Recent History, deleting all the visited data from the last hour, two hours, four hours, today or everything.

If you have closed some windows by mistake and you really need them back in order to continue what you were doing, you can enter History and select Recently Closed Windows.
More than these, you now can save videos like you have been saving images, just by right clicking and selecting Save Video As.

If you are in a new place, spending your time on the computer, browsing websites, and at some point you need to tell your friend where to come and find you, without knowing the exact address, you can ask Firefox for help by using a cool new feature called Location Aware Browsing. It will try to set your location on a map and display it to you.

Firefox 3.5 is fully customizable and you can choose from various themes, add-ons, and so on.
Mozilla Firefox 3.5 will be available for download for Windows, Linux and Mac OS X.

Upcoming Firefox 3.5 Features

Sierra Monica B. — Thu, 18 Jun 2009 09:53:42 +0000

Preparing to release a new version of the popular Firefox web browser, Mozilla invites web developers and curious Firefox fans to test the release candidate.
Over 800,000 Firefox 3.5 3.5rc1build2 testers will receive a software update for the last tests and feedback. They will get several bug fixes that Mozilla says it will include in the final release of the browser version 3.5, which is to be available by the end of this month.

According to Mozilla, the latest update is stable, allowing users to perform their daily tasks via the web browser.
Beta testers can wait for the update to be delivered automatically or get it manually from the Help menu, by selecting the Check for Updates option.
For those who aren’t beta testers Mozilla will make available the Firefox 3.5 Release Candidate next week, but you still can sign up as beta tester by installing the latest version.

Like any other beta software, Firefox 3.5 Beta still can have several issues that might interfere with daily browsing, such as in the case of inexperienced users, and if this is your case Mozilla recommends you to wait for the official Firefox 3.5 release.

New features that you can expect from Firefox 3.5 include HTML 5 support for audio, video, offline resource specification, and dragging and dropping of items between sites. In addition it includes downloadable fonts, support for CSS media queries, support for Geolocation API, mouse gesture events, new JavaScript 1.8.1 features, cross-site access controls for HTTP, DNS prefeching, new canvas features, ICC color correction for tagged images, and different improvements at the security level.