Mozilla Firefox 3.1 Beta 3 Released

Sunday March 15th, 2009

Mozilla Firefox 3.1 Beta 3 has been released. This milestone is a public preview release intended for developer testing and community feedback. This milestone includes improvements to private browsing mode, and better performance and stability with a new Tracemonkey engine

Firefox 3.1 Beta 3 can be downloaded from the Firefox beta page. The Firefox 3.1 Beta 3 Release Notes have more details, including information about what's new in Firefox 3.1 and what's been improved in this specific milestone. The Mozilla Developer News weblog's announcement of Firefox 3.1 Beta 3 includes more details of interest to developers.

The next beta release of Firefox will be labeled Firefox 3.5 Beta 4. The decision to rename Firefox 3.1 to Firefox 3.5 reflects the sheer volume of work that makes it feel more than a small update to Firefox 3.0

A security and stability update for Firefox 3.0 was released recently. Firefox 3.0.7 includes fixes for several critical security and stability issues.

#1 Try It Using Firefox Portable

by CritterNYC

Monday March 16th, 2009 5:43 AM

As always, you can try it out using the portable version from so it doesn't mess with your local install:

#2 Wrong link

by Mozinet

Monday March 16th, 2009 9:42 AM

Mozilla Developer News weblog's announcement of Firefox 3.1 Beta 3 link is wrong. The correct URL is .

#3 Re: Wrong link

by Nitin

Monday March 16th, 2009 2:21 PM


#5 promptOnSanitize

by bamm

Saturday March 21st, 2009 6:16 PM

The setting privacy.sanitize.promptOnSanitize no longer seems to work. I always set this to false. I LOVED being able to Ctrl+Shift+Del and have everything cleaned up without a prompt. It's great when somebody arrives and you want to quietly clear the private data.

#9 What happened to the star for one click bookmarks?

by marco2

Sunday April 5th, 2009 7:51 AM

The star for one click bookmarks that is in Firefox 3.0 does not seem to be there in Firefox 3.1 beta3. Is there anything that I can do to restore it?

#10 The star is there. I looked in the wrong place.

by marco2

Monday April 6th, 2009 11:45 AM

My error. The star is there. I looked in the wrong place on the page.

#13 Query

by veerakumar

Monday May 25th, 2009 11:26 PM

The has FireFox 3.5 beta series in the website. Is it same as FireFox 3.1 beta?

Visit me At

#26 Hellooooo...?

by mcgeheezone

Monday June 15th, 2009 6:38 AM

Looks like this site has been abandoned to the spammers. Seems to me if that so, though -- the link from ought to be removed.

#41 Whoa?!? -- What's up with all the spam?

by zachariah

Thursday June 25th, 2009 3:34 PM

Also, Firefox 3.5rc3 is released: