"Please note: Firefox 3 Beta 5 is a public preview release intended for developer testing and community feedback. It includes new features as well as dramatic improvements to performance, memory usage and speed. We recommend that you read the release notes and known issues before installing this beta..." -- ftp://ftp.mozilla.org/pub/firefox/releases/3.0b5/linux-i686/

"Please note: We do not recommend that anyone other than developers and testers download the Firefox 3 Beta 3 milestone release. It is intended for testing purposes only. Firefox 3 Beta 3 is now available for download. This is the eleventh developer milestone focused on testing the core functionality provided by many new features and changes to the platform scheduled for Firefox 3. Ongoing planning for Firefox 3 can be followed at the Firefox 3 Planning Center, as well as in mozilla.dev.planning and on irc.mozilla.org in #granparadiso. New features and changes in this milestone that require feedback include..." -- ftp://ftp.mozilla.org/pub/firefox/releases/3.0b3/linux-i686/

"Please note: This Firefox 3.5 Preview is intended for developer testing and community feedback. We recommend that most users wait for the official Firefox 3.5 release, which is coming soon..."

"Please note: We do not recommend that anyone other than developers and testers download the Firefox 3 Beta 1 milestone release. It is intended for testing purposes only..."

ftp://ftp.mozilla.org/pub/firefox/nightly/latest-trunk/

Firefox 3.1 Beta 1 was released on October 14, 2008 and it currently comes in 36 fully-localised languages. This beta is based on Gecko 1.9.1 layout engine and according to the official website, this release features "significant changes to improve web compatibility, performance and ease of use". You can read the release notes on the official website, here.

Mozilla announced today the official release of Firefox 3 beta 4, which includes over 900 additional improvements related to the previous beta release. At this stage in development, most of the work on Firefox is heavily focused on polishing the user interface, refining performance, and reducing the memory overhead. These efforts clearly show in beta 4, which is highly robust and impressively responsive.

"Firefox 3 Beta 4 is now available for download. This is the twelfth developer milestone focused on testing the core functionality provided by many new features and changes to the platform scheduled for Firefox 3..." -- ftp://ftp.mozilla.org/pub/firefox/releases/3.0b4/linux-i686/

Firefox 3 developers are taking all the time that they need to accomplish their new Firefox. After the Beta 1 Mozilla has released Firefox 3 beta 2 to get more feedbacks about bugs from its testing community. Bugzilla was a little bit busy lately since the beta 1 thousands of bugs fortunately 900 of them are fixed. Firefox developers are trying to reveal more bugs to make their Firefox 3 better. The Beta 2 features are very promising and the Firefox 3 will definitely beat all competitors.

The release candidate build of Firefox 3.6.4 is now available for download and public testing. This version fixes issues found in the previous beta of Firefox 3.6.4.