The third beta of the Firefox 3.1 web browser has been released by the Mozilla development team just a few hours ago. It can be downloaded from the official website in all supported languages and for all supported operating systems. The release notes contain information about the improvements in this beta version of the Firefox web browser including performance and stability improvements with the new TraceMonkey JavaScript engine, native JSON support, private browsing improvements, improvements to the Gecko layout engine with one of the effects being faster content rendering and support of new web technologies such as CSS 2.1 and 3 properties, offline applications and audio and video elements.
The very same page lists a few known issues of the Firefox 3.1 Beta 3 web browser. This includes a Google Mail bug (can be resolved by reloading the page), no new window creation when dragging tabs on the desktop, choppy OGG audio and video playback on old computers and SSL website loading problems after returning from private browsing mode.
Firefox 3.1 Beta 3 will access the user profile on the computer if another version of the Firefox web browser is installed. Several of the installed Firefox add-ons are at this time not compatible with the latest beta version of Firefox and will fail to load unless the user forces compatibility with Nightly Tester Tools.

Users who do not want to mess with their default installation of the Firefox web browser can download and use a portable version of the beta instead.
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And nice that communication with Hotmail is possible without any problem again.
Does anyone know when Ubuntu will issue Firefox update to at least version 3.0?
Firefox 3.1 is now referred to as 3.5 now (ever since March17) as 3.1b3 test release is the last to be labelled as 3.1 as it will be 3.5b4 when the Beta4 is released for testers.