Firefox 4 Beta: Latest Update is Here – what's in for web developers?

The latest Firefox 4 Beta has just been released (get it here). This beta comes with hundreds of bug fixes, Firefox Sync and Firefox Panorama. Here is a quick overview of the new features for web developers.

About Paul Rouget

Paul is a Firefox developer.

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  1. Andy L

    Why isn’t Firefox already supporting border-radius without the -moz prefix, like Google Chrome 5, Safari 5, IE 9… ?

    August 24th, 2010 at 17:02

    1. WulfTheSaxon

      See and specifically

      August 24th, 2010 at 17:45

    2. Christopher Blizzard

      There’s a bug open to do that. It’s more than just renaming since there are some differences between our -moz-border-radius implementation and the new border-radius spec.

      August 24th, 2010 at 18:00

      1. Andy L


        Thanks for your prompt reply. Will the fix get included in Firefox 4?

        August 24th, 2010 at 18:16

        1. Andy L

          From the page for bug #451134 (thanks WulfTheSaxon), I see that the fix will show up in a future beta — good to know. :)

          August 24th, 2010 at 20:32

    3. thinkdj

      I agree. Why is it?

      August 25th, 2010 at 11:00

  2. John Doe

    Firefox no-longer functions properly on Mac OS X 10.6.4 I can’t open tabs and use them, can’t access Preferences since it wont open when I click on it, I can’t do anything in it anymore. Firefox has failed me now since 4.0 Beta 3… When will these bugs be fixed in Firefox so it’ll run properly again? because at the moment I’m stuck using Chrome as my alternate browser untill Firefox bugs in Beta 4 are fixed. All functionality in Firefox 4.0 BETA 4 has made it an unusable browser, can’t browse, Open Preference Settings, can’t submit feedback about it, can’t access the Help Page, can’t do any thing!

    August 25th, 2010 at 09:09

  3. Piero Giusti

    The FullScreen API proposed in the Roadmap Slide ( ) will be released in the Fiefox 4?

    August 25th, 2010 at 09:37

  4. Jerome Covington

    Did the experimental Audio API make it into this beta update?

    August 25th, 2010 at 12:14

  5. Collin J.

    @Jerome Covington: Nearly, but was backed out again.

    August 26th, 2010 at 08:13

  6. Jerome Covington

    @Collin Blerg! Any chance that it will make it into the final 4 release?

    August 26th, 2010 at 10:07

    1. Paul Rouget

      @Jerome It will probably be in the beta5 (it’s in the nightlies)

      August 26th, 2010 at 15:55

  7. dom

    It takes twice as long for firefox 4 beta 5 than explorer !

    September 9th, 2010 at 18:47

  8. Brona

    Hi, how about supporting web forms finally?

    September 20th, 2010 at 16:18

  9. Robério Azerêdo

    Firefox 4 is great! Congratulations Mozilla. Thank you for existing!

    February 16th, 2011 at 07:48

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