Firefox 3.1 targeted for year’s end

Firefox 3.1Mike Shroepfer, Mozilla VP of Technology announced today a draft plan for Firefox and the Mozilla platform beyond the upcoming Firefox 3 (and attached Mozilla platform 1.9) release next June.

Most notable is Firefox 3.1, the next update to the Firefox 3 branch. It would add a few features that were not ready to ship in Firefox 3 development time frame. Among the most relevant:

  • Support for the <video> as defined in the HTML 5 specification. Chris Double has been working on this for about a year now and there are even a few experimental Firefox builds featuring it with native Theora (Ogg) support. Whether or not a certain codec must be part of the specification was the subject of a lengthy discussion last year. Sadly, one of the reasons to oppose Theora as a mandatory codec is the fear of a submarine patent that could make browser vendors vulnerable to a patent lawsuit.
  • Support for cross-site XMLHttpRequests (XHR) which would allow more powerful web applications and an easier way to implement mashup. Support for cross site XHR was pulled out of Firefox 3 code due to ate changes to the specification.
  • More power for Firefox 3′s location bar. Mike Beltzner, Firefox 3 lead, talked recently about how the search and location bars could be merged. In an intuitive way. SeaMonkey -and the Mozilla suite before- already does this but the implementation is not the most discoverable.
  • More performance tuning, better system integration.
  • Native JSON DOM binding, a powerful feature for web developers.

It would branch from the Mozilla2 code (known as mozilla-central, in the works for eight months already) sometime this summer, in Mercurial, the new version control system Mozilla is moving to from CVS.

Firefox 3.1 would be targeted for this year’s to intentionally coincide with Firefox Mobile (Fennec) development and release, making it the fastest update in Firefox history. It usually takes about a year between releases.

Firefox 4 is targeted for late 2009 (back to year long development cycles) and would introduce Mozilla2, an extensive update to the Mozilla platform to feature highlights like ActionMonkey, the merge of Mozilla’s JavaScript engine (SpiderMonkey) and Tamarin, Adobe’s JavaScript virtual machine open-sourced in late 2006.


  1. Stefan May 20, 2008 2:38 am 

    Yeah, I already noticed a couple of days ago that the Firefox4 nightly builds changed into Firefox 3.1.

  2. Rockstyle May 20, 2008 5:01 am 

    Does it mean that Firefox3.1 will pass Acid3?

    • frostie May 21, 2008 2:41 am 

      Who cares?:D

  3. May 20, 2008 11:10 am 

    Firefox 3.1 targeted for year’s end – Mozilla Links…

    Mike Shroepfer, Mozilla VP of Technology announced today a draft plan for Firefox and the Mozilla platform beyond the upcoming Firefox 3 (and attached Mozilla platform 1.9) release next June. Most notable is Firefox 3.1, the next update to the Firefox …

  4. Thomas May 20, 2008 3:22 pm 

    Good news, but better CSS 2/3 and XHTML support would be a nice enhancement too.
    Where is the html/css web developer fraction in the Mozilla team?

  5. Amarjeet Singh Rai May 20, 2008 5:55 pm 

    I hope it passes the Acid3 with flying colours (if you know what I mean).

    That should be a priority, but a huge one. Speeding up the loading, of bookmarks and the places when you start Firefox should a high priority. Its quite slow when you open firefox.

  6. Andrew May 21, 2008 11:46 am 

    This is great news. I’ve always wanted the search bar and address bar to be combined. Hopefully it’ll pass on the Acid 3 test

  7. Mozilla May 21, 2008 11:50 am 

    I wonder what the filesize now is compared to previous versions, surely it takes up more system resources

  8. JP May 22, 2008 4:15 am 


    What was the target date for 3.0 again?
    And obviously even 3.0RC is still far from being ready: it just “forgot” ALL of my bookmarks. Not good.

  9. KS May 22, 2008 2:23 pm 

    I think FULL support for CSS3 and XHTML/HTML5 would be the most I could ask for as a web developer. The JSON/DOM and XHR sounds awesome too!

  10. Sedim May 23, 2008 10:39 am 

    Actually one of the main points of Firefox 3 is improved memory management. Better performance and lower resource requirements have been there since beta 1.

  11. rpgfan3233 May 23, 2008 4:18 pm 

    What I would enjoy seeing is some XHTML 2.0 support since HTML5 is being worked on. Of course, a lot of things are unstable with XHTML 2.0, whereas HTML5 is pretty solid already. I suppose that is the reason why none of it is implemented. Of course, facilities exist to do it. It just isn’t natively implemented the way that MathML or XLink are.

  12. F3nNec July 3, 2008 6:17 am 

    haha already using 3.1 =P just great

    • Somebody July 18, 2008 7:48 am 

      Well, you are probably using 3.0.1

  13. Von Ryan July 21, 2008 5:21 pm 

    Wish they would hurry up with 3.1 to fix all the problems with 3.01 So many users going back to FF2 or IE.

  14. Brad Koch July 24, 2008 9:57 am 

    The Acid tests aren’t the most critical thing in the world. Sure they’re nice, but they just test for a selected group of features, while Mozilla is currently concentrating on other ones. They’ll get to it eventually.
    As for all the standards stuff, as far as I’m aware Firefox is in conformance with the w3′s latest CSS, HTML, and XHTML Recommendations: CSS2, HTML 4.01, and XHTML 1. Firefox can’t be expected to support something that isn’t finished yet. Enthusiasm is great, but if you want to see the standards support move faster, take it up with the w3. They’ve been crawling along on standards development for years.

  15. Theora ondersteuning in Firefox 3.1 | DailyBlog August 4, 2008 2:01 am 

    [...] voor het vrije videoformaat Theora. Bij de volgende release welke op de planning staat voor eind 2008 zal de webbrowser dus out-of-the-box dit formaat gaan ondersteunen. En hoewel dit niet interessant [...]

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