Today, three months after the release of Firefox 4, we release Firefox 5, thanks to our new development cycle. Developers will be able to create richer animations using CSS3 Animations. This release comes with various improvements, performance optimization and bug fixes.

CSS3 Animations

CSS Animations (check out the documentation) are a new way to create animations using CSS. Like CSS Transitions, they are efficient and run smoothly (see David Baron’s article), and the developers have a better controls over the intermediate steps (keyframes), and can now create much more complex animations.

Notable changes

Other Bug Fixes and Performance Improvements:


Canvas improvements

  • The <canvas> 2D drawing context now supports specifying an ImageData object as the input to the createImageData() method; this creates a new ImageData object initialized with the same dimensions as the specified object, but still with all pixels preset to transparent black.
  • Specifying non-finite values when adding color stops through a call to the CanvasGradient method addColorStop() now correctly throws INDEX_SIZE_ERR instead of SYNTAX_ERR.
  • The HTMLCanvasElement method toDataURL() now correctly lower-cases the specified MIME type before matching.
  • getImageData() now correctly accepts rectangles that extend beyond the bounds of the canvas; pixels outside the canvas are returned as transparent black.
  • drawImage() and createImageData() now handle negative arguments in accordance with the specification, by flipping the rectangle around the appropriate axis.
  • Specifying non-finite values when calling createImageData() now properly throws a NOT_SUPPORTED_ERR exception.
  • createImageData() and getImageData() now correctly return at least one pixel’s worth of image data if a rectangle smaller than one pixel is specified.
  • Specifying a negative radius when calling createRadialGradient() now correctly throws INDEX_SIZE_ERR.
  • Specifying a null or undefined image when calling createPattern() or drawImage() now correctly throws a TYPE_MISMATCH_ERR exception.
  • Specifying invalid values for globalAlpha no longer throws a SYNTAX_ERR exception; these are now correctly silently ignored.
  • Specifying invalid values when calling translate(), transform(), rect(), clearRect(), fillRect(), strokeRect(), lineTo(), moveTo(), quadraticCurveTo(), or arc() no longer throws an exception; these calls are now correctly silently ignored.
  • Setting the value of shadowOffsetX, shadowOffsetY, or shadowBlur to an invalid value is now silently ignored.
  • Setting the value of rotate or scale to an invalid value is now silently ignored.


  • Support for CSS animations has been added, using the -moz- prefix for now.


  • The selection object’s modify() method has been changed so that the “word” selection granularity no longer includes trailing spaces; this makes it more consistent across platforms and matches the behavior of WebKit’s implementation.
  • The window.setTimeout() method now clamps to send no more than one timeout per second in inactive tabs. In addition, it now clamps nested timeouts to the smallest value allowed by the HTML5 specification: 4 ms (instead of the 10 ms it used to clamp to).
  • Similarly, the window.setInterval() method now clamps to no more than one interval per second in inactive tabs.
  • XMLHttpRequest now supports the loadend event for progress listeners. This is sent after any transfer is finished (that is, after the abort, error, or load event). You can use this to handle any tasks that need to be performed regardless of success or failure of a transfer.
  • The Blob and, by extension, the File objects’ slice() method has been removed and replaced with a new, proposed syntax that makes it more consistent with Array.slice() and String.slice() methods in JavaScript. This method is named mozSlice() for now.
  • The value of window.navigator.language is now determined by looking at the value of the Accept-Language HTTP header.


  • Regular expressions are no longer callable as if they were functions; this change has been made in concert with the WebKit team to ensure compatibility (see WebKit bug 28285).
  • The Function.prototype.isGenerator() method is now supported; this lets you determine if a function is a generator.


  • The class SVG attribute can now be animated.
  • The following SVG-related DOM interfaces representing lists of objects are now indexable and can be accessed like arrays; in addition, they have a length property indicating the number of items in the lists: SVGLengthList , SVGNumberList , SVGPathSegList , and SVGPointList.


  • Firefox no longer sends the “Keep-Alive” HTTP header; we weren’t formatting it correctly, and it was redundant since we were also sending the Connection: or Proxy-Connection: header with the value “keep-alive” anyway.
  • The HTTP transaction model has been updated to be more intelligent about reusing connections in the persistent connection pool; instead of treating the pool as a FIFO queue, Necko now attempts to sort the pool with connections with the largest congestion window (CWND) first. This can reduce the round-trip time (RTT) of HTTP transactions by avoiding the need to grow connections’ windows in many cases.
  • Firefox now handles the Content-Disposition HTTP response header more effectively if both the filename and filename* parameters are provided; it looks through all provided names, using the filename* parameter if one is available, even if a filename parameter is included first. Previously, the first matching parameter would be used, thereby preventing a more appropriate name from being used. See bug 588781 .


Developer tools

  • The Web Console’s Console object now has a debug() method, which is an alias for its log() method; this improves compatibility with certain existing sites.

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Comments are now closed.

  1. Bill Theod wrote on June 23rd, 2011 at 09:08:

    Everything’s fine with CSS3 stuff but I wonder, when are you going to make Firefox stable? It crashes all the time (some times it lasts more than a minute or two). It takes more than one Gb of my PC’s ram and 30% CPU!
    Firefox rapes our PCs!!!
    I definitely prefer Chrome where I can use almost the same addons without any crashes. If I have to use Firefox I must downgrade to version 3.x (not so many crashes).
    I know you’ll say that maybe it’s some addons that cause the problem and I’ll answer you: give me a reason to use Firefox except the addons flexibility.

    1. louisremi wrote on June 24th, 2011 at 09:07:

      We do not want our users to stop using addons at all. But we encourage them to try disabling all addons to see if it solves their performance problems.
      In the end, we want users to be able to report valuable information when they encounter problems with Firefox.

      1. Bill Theod wrote on June 25th, 2011 at 02:31:

        Users all over the world reporting problems like this almost every day. I disabled the addons but firefox was unstable again. And every new release is worst than the old ones.
        I was a big Firefox fun but the fact that you don’t do anything to solve these issues makes me to put it in the same place with ie (garbages).
        The only reason I have it installed in my PC is that I have to check with every browser every site I design…

  2. Paul wrote on June 23rd, 2011 at 15:41:

    I’ve been a loyal Firefox supporter for years, but version 4 had clunky bits that literally forced me to use Chrome because FF simply stopped working. Now you say that a ‘major ‘ release is every 6 weeks! In truth, they are minor releases, and breaking convention and being non-standard in your release numbering is just the type of arrogance and spin that caused people to leave IE and move to FF! Get with the plan guys! Use standards EVERYWHERE. This is version 4.1!

    1. louisremi wrote on June 24th, 2011 at 09:11:

      As browser vendors switch to a rapid release cycle (like Chrome and Firefox have done), version numbers will matter less and less.
      What matters is our ability to deliver new features and improvements faster to our users.

      1. Paul wrote on June 24th, 2011 at 16:45:

        What matters to this user isn’t new features faster and faster, but old features that we use everyday continuing to work, and new features added reliably. Version 4 had problems and I couldn’t revert back to version 3. So I had to install Chrome just to do a few tasks I needed done. Version numbers DO matter, in a suttle way.

      2. Big Red wrote on August 17th, 2011 at 10:56:

        I’m going to delete firefox. It is total crap. It goes down 20-30- times a day. The addons don’t work worth a shit anymore. RDR is a joke.louisremi you are a liar IMHO! Keep up the bullshit and nobody will be using your totally crappy browser anymore. You ought to call it Sludgefox!

  3. Don wrote on June 23rd, 2011 at 20:26:

    One of my key web applications and add-ons, a bibliographic database, just managed to release a version compatible with 4.0 this week. Now, I see that the add-on manager says it will not work with 5.0. Is this going to happen every six weeks? Too much. Guess its time to see which other browser I can use. Or, uninstall 4.0 and go back to 3.whatever (which I have on all my other computers). What a mess you’ve made of this. Ugh.

    1. louisremi wrote on June 24th, 2011 at 09:14:

      I guess you are talking about Zotero, which is already compatible with Firefox 5, yay!
      On the + side, more frequent release means less backward incompatible API changes between 2 releases.
      For most addons and most future Firefox release, updating an addon will just be a matter of updating the version string in a config file.

      1. voloch wrote on June 26th, 2011 at 11:25:

        All versions after 3.0.x are too bloated and greedy. Even without any addons or plugins turned on! They consume much more CPU time, memory. One reason I do not use IE is its high CPU usage in certain situations. Now, Firefox is going to absolutely maximum in this. But it will have rapid versions change. So inspiring! I suppose users need no such an “improvements”. I’m still using FF 3.0.19. This is, I see, the highest version of Firefox i’ll use. Maybe Firefox 127… :D
        (Opera since v10 has changed their browser even worse, so that don’t be afraid :D)

        1. louisremi wrote on June 27th, 2011 at 05:58:

          If you find pages where Firefox uses more CPU than usual, you should file a bug on
          You can find a good tutorial here:

  4. DazzaJ wrote on June 24th, 2011 at 04:16:

    Unfortunately it still seems much slower that Chrome and has issues with addons.
    It basically is just version 4 with a couple of tweeks.
    It still falls well short in the HTML 5 tests compared to chrome as well as the java tests.
    I think Mozilla seem too intent on copying their rivals and upgrading version numbers than actual performance or features.
    Firefox has fallen to my 2nd browser of choice since release of version 4, Chrome takes the lead.

  5. jswidget wrote on June 24th, 2011 at 05:41:

    Firefox 4.01, which should be called finally fixed the annoying out of canvas put/getImageData issue. Great thanks, no walk-around needed

  6. Serp wrote on June 24th, 2011 at 05:51:

    If Chrome figures out to put the file menu back, including a favorites bar and easy options setting, plus manages to figure out how to give better extension support (mostly for Ad Block Plus) then Firefox is pretty much finished.

    The Firefox team seems intent on just copying Chrome but being worse at everything. So while Chrome will improve, Firefox will just get worse because it will always be a step behind.

    3.6 was the last great Firefox version. 4 is pointless but Chrome still lags a little behind in certain things that for me are enough to use Firefox. At least 5 didn’t break things from 4, just don’t know really what the improvements were. Just call it 4.1 and be done with it.

  7. Debbie wrote on June 24th, 2011 at 10:10:

    Question: How can I downgrade to firefox 3??? I liked that version much better than 4 or 5, mostly because I can get PARENTAL CONTROLS. Thinking of switching to another version. Chrome have parental controls?

  8. Carmen Brodeur wrote on June 24th, 2011 at 10:44:

    Now my favorite addon of all time – nodo follow won’t work! Not compatible with 5.0. What should I use instead? or should I downgrade to lower version of firefox?

  9. Rune Jensen wrote on June 24th, 2011 at 11:49:

    I do not understand all those who have problems with firefox craqshing? I haven’t had a crash since 3.5 or so.. And this is nothing different. You choose you addons and extensions wisely, then you will not crash!

    Good work, though I agree that 5.0 is a strange number. I gess we will all get used to it though.

  10. Webgranth wrote on June 24th, 2011 at 21:55:

    I was eagerly waiting for the release of the new version of the Firefox.

  11. Ryan wrote on June 25th, 2011 at 05:23:

    To all the people complaining about crashes. Firefox IS NOT unstable. What makes it unstable is your user profile. Over time, and especially over multiple versions of Firefox, the profile accumulates tons of settings, add-ons, and other bloat that eventually causes conflicts and bugs that cause Firefox to crash. If you want to see how fast, secure, and stable Firefox really is, create a new profile.

    1. But How? wrote on June 26th, 2011 at 20:41:

      How do I create a new profile? What’s entailed in this?

      1. Ryan wrote on June 27th, 2011 at 07:06:

        You’ll lose all your personal data–bookmarks, history, passwords, extensions–but if you’re using Firefox Sync, the only thing lost will be extensions.

    2. Big Red wrote on August 17th, 2011 at 10:58:

      Blame the user! What bs! Quit using sludgefox. it is crap!

  12. Alexander Gelbukh wrote on June 25th, 2011 at 06:30:

    “What makes it unstable is your user profile.” In other words, FireFox is OK, what makes it so bad as it is is the fact that we (still) try to use it. Unless you use it, it’s perfect!

  13. Anupam Gangopadhyay wrote on June 25th, 2011 at 08:01:

    We need Firefox5 for Samsung Bada Operating System. Is it Possible?

    1. louisremi wrote on June 27th, 2011 at 06:01:

      We are currently focusing on Firefox Mobile for Android, but follow other mobile environments closely.

  14. obiwahn wrote on June 25th, 2011 at 09:27:

    Why are you all complaining about the version numbers?
    As long as they strictly monotonic increasing i don’t care about the distance^^

  15. Andres Riofrio wrote on June 25th, 2011 at 15:01:

    It’s just a number.

    It breaks extensions now, but I think developers will learn to disable the compatibility check (

    I’m happy. Some extensions were disabled, but this is temporary. On my Ubuntu box, Firefox gets updated automatically, but on other systems, it’d be nice if it did.

    I understand there are companies that would not like their browsers to be updated automatically. This should be easily changeable at installation time or with a user preference.

  16. Piglet wrote on June 26th, 2011 at 10:28:

    I find Firefox is just becoming a rather ugly version of Chrome.

  17. Snapafun wrote on June 27th, 2011 at 05:04:

    Updated to FF5 and now I have some real issues. I came to FF years ago and have been faithful – TILL NOW.
    FF5 is slower and the number of broken addons is excessive.

    Your comment earlier “We do not want our users to stop using addons at all” is laughable at this time because more than half of my regular addons fail even though most of them claim to be compatible with FF5.

    FF4.0.1 solved issues and I personally found it stable. FF5 is so stable it will sit there and do nothing for minutes at a time. And when I choose to use the feedback feature – that dies as well.

    Now I need to look elsewhere because I choose to do some work these days, not sit here all day trying to get things to work.

    Here’s an example – Fast Dial has always followed the updates – today it installs, I get to see TWO entries in the right click menu, the options don’t stick and I’ve lost visual access to my library of links. Think it’s the addon? Try loading a new tab and explain why the url doesn’t render as “about:blank” – something needed for such addons to work. The url and page simply open blank – nothing – just blank. Something in FF5 has shut active events for this down??? I’m not a coder though I’ve seen many different events over the years and this smacks of SHUT DOWN just as things did with WinMe at the turn of the century.

    Me thinks you have gone backwards – FF has become a heavy app that sucks resources and takes its’ time getting things done. Feels like a windows app more and more.

    I appreciate that many hours have been voluntarily put to FF – it’s just that you focus has become tunneled to suit your purpose and seeing the users requirements has no place with you anymore. For a long time now the resource issue has been out there and if anything it has just got worse.

    Backward compatibility is not even considered these days and if we have a machine more than a year or so old – tough!

    Bad user satisfaction and I fear many have migrated not to return. Shame, I really do like FF BUT I NEED TO GET SOME WORK DONE!

  18. erica wrote on June 27th, 2011 at 18:57:

    after updating to 5.0 i got a virus as mcafee was disabled for the update. i now can not access the internet via firefox due to ‘proxy server error’. i am a computer novice and have no idea how to fix this…..can anyone help me?!!!!

  19. Arsimael wrote on June 28th, 2011 at 06:54:

    Sorious Guys, I’m using Firefox since it’s name changed to “Firebird”, but your current “developing” makes me looking for alternative browsers.

    I don’t wan’t to get mad every three month because my Addons are not working because theres a new bugfix which has to be delivered through a new Majorversion which deactivates all my addons beause they’re “not compartible”.

    Sorry Guys. It was a nice time. But I need a Browser which does not fuck up all my addons and options because the Developers think they need a Number with two digits at the end of the name. And Firefox is nearly unusable through this “We-need-a-higher-Version-to-be-as-cool-as-opera-or-chrome”.

    It would be very less troublesome to write a 4.1 at the end of the name nstead a 5…

    1. R-J wrote on August 10th, 2011 at 16:29:

      pffff, version number wise only opera is really cool, they have the history to deserve it. ps, nice document:

      Firefox 3.8, it isn’t my main browser, but I have to say I have little problem with it. The interface changes following Opera and Chrome leave me more screen-real-estate on these modern-age wide-screens.

      And now more standards support. This is an exciting time with the implementation of HTML5, css3 and the race to be the fastest. And FF is looking good in it. Not the top, but it is an honest browser that I trust will pull itself back to it fast enough.
      You can’t expect fast development to go without hiccups.

      Where Google has money and some great minds and Opera has people that live for the web, open-source is about communities. People, send your bug-reports and give your support. You don’t have to be a programmer to contribute.

      Anyway, (a late) congrats on the new release, lovin’ it!

  20. haroldandresme wrote on June 28th, 2011 at 19:20:

    Older version of FF is BETTER the latest versions.. Problems should be fixed asap. the new version of IE is BETTER the FF new version., :( I want to use FF., but it always crushed.

  21. Snapafun wrote on June 29th, 2011 at 02:32:

    Got my Fast Dial Back for now… had keep my download of version 4 so went ahead and re-installed it – hello Fast Dial – welcome back. now to see if I can still download version 4.0.1.

    If anyone here gets Fast Dial reliable in FF5 – please post back here so I can look at trying FF5 again. TIA

  22. Snapafun wrote on June 29th, 2011 at 03:04:

    Update: Anyone else needing to get back to FF4.0.1 can get it here.

  23. josh wrote on July 2nd, 2011 at 13:10:

    I think people are more bugged by the name then any thing else. I remember when 3.0 came out it meant something to finally be out of 2.x and there was real changes then again with 4.0 but with 5.0 it feels to quick and falls externally short of a title as 5.0 from a great company and is a smack in the face of fans from the 2.x era and I’m sure fans from dating back to the 1.x era feel a punch to the gut when you say a minor update and almost no ui update a full fledge new series of firefox. At first I thought I was being attacked by a hacker when it said 5.0. Then after it updated to me it still felt like 4.0. When I hear of 5.0 I think of a fire fox that is 300x faster then 4.0 has a new loading system. smashes html5 standers so much so it feels like its asking for html6. Maybe even have thunderbird built right in ff5. Has Smart Voice so you can talk to fire fox.Use a web cam so firefox can see you and understand you when you point at some thing. Thats my idea of ff5 another break through in web browser technology but hey thats just a loyal fans idea of ff5. Names matter more then you think. After all would you want an Olympic mettle or a trophie from a little league after all theres just names there the same sport but at different levels. Names are earned.

  24. Snapafun wrote on July 3rd, 2011 at 04:17:

    Basically, I got Fast Dial back by downloading the beta version. Even this suggests that there’s nothing wrong with Fast Dial, just that things have been taken out of the hands of developers especially in FF5 so they are frustrated somewhat. Regardless, you can get Fast Dial back with FF5 by going to this url: Enjoy.

  25. obiwahn wrote on July 4th, 2011 at 03:03:

    As said – I don’t care about the funny numbers:) But maybe you want to introduce some kind of version number or something like the component object model for the plugin interface. Not working plugins (because of version number breakage) are in fact a annoyance – ok – i have no problem fixing that .. but some other people here seem to fail:P

  26. rayblan wrote on July 5th, 2011 at 01:20:

    Why can’t the google toolbar be made compatible with so that I can download the upgrade?

  27. snoopy wrote on July 7th, 2011 at 04:18:

    I assume you haven’t dropped support for @fontface? Tried a reinstall without plugins but still doesn’t work. Any suggestions? I’m using the Paul Irish ‘bulletproof’ method at the moment.

    1. louisremi wrote on July 7th, 2011 at 05:36:

      We still and will likely always support @fontface.
      Please use forums for support requests not related to this article :-)

  28. anand wrote on July 7th, 2011 at 14:37:

    I have firefox 5 on Solaris 10 (x86) and none of the youtube flash videos are working. I could view some flash videos from a site though. Strangely the flash settings manager content isn’t visible now. Any idea?

    1. anand wrote on July 7th, 2011 at 14:38:

      BTW, I have flash 10.3 r181

  29. Rob wrote on July 10th, 2011 at 06:26:

    What a lot of extraordinary negativity! I’m finding FF better than ever.
    FF4.0.1 was better than FF4 which was better than 3.6, though I took a few days to appreciate & figure out the new UI.
    FF5 has been the best release, so much so that I’ve actually started running Aurora 7.0.2 Alpha without much issue.. AND guess what my most important Add Ons work! NoScript, WoT & Adblock Plus (HashColouredTabs+ to).
    Everything else is just nice to have…
    I USED to have crashes under Win & Linux, with FF 3.x regular, but they’re few and far between since FF4.

  30. laz123 wrote on July 10th, 2011 at 11:21:

    I’ve always been a Firefox fan, since the 2.x version. Lately I think Google Chrome is a lot better in many ways, so… I’m starting to prefer it over Firefox. It’s sad to see such a disrespetful marketing strategy followed by Firefox by naming the current version 5.0, as many of you have already pointed out. Extension support isn’t great and it still requires a browser restart. Resource usage is incredibly high.
    I need to be re-convinced that firefox is the best browser out there, i hope they’re gonna do smth about it.

  31. Seth wrote on July 12th, 2011 at 15:53:

    extensions need to abandon “maxversion” entirely as rapid release equals rapidly broken extensions

    firefox is (was?) popular because of its extensions

    adblocking is a security necessity for interweb use for users incapable of not-using the wrong local security context

  32. Gemma wrote on August 15th, 2011 at 08:01:

    Don’t know why people are complaining to FF about the crashes and freezes. Do something about your PCs.

    I use a £300 crappy laptop from Compaq, and FF5 has not crashed on me. The worse it does is to freeze for 30 seconds sometimes, and that’s because I have 3GB RAM with TweetDeck, Chrome, FF, Dreamweaver, etc all open, and usually have multiple tabs and addons/extensions in Chrome/FF.

    The crashes are not down to FF. It’s down to your PC hardware setup/config, and possibly the OS you use.

  33. Peter wrote on September 1st, 2011 at 13:35:

    I too felt the new number (5) was some scam by a hacker, haha. Firefox saddens me because it has abandoned it’s niche in the market. For people who want a flashy browser with no ability to control, just to surf, they can use Chrome. For people who want a powerful but resource light, highly usable browser, they can use FF. But now there is no option for users of the second category, other than using older versions of FF. I agree with the consensus that FF 3.x was the last great FireFox.

    Just as an example of how great the previous versions of FF were, I use FF, the last version before 3, on a 400MHz Win 98SE machine! This version was the modern version in the fairly recent year of 2008. It was meant to take advantage of multi-gigahertz machines running Vista, and yet is resource light enough to be a great browser on this vintage machine from 1999.

  34. Cookie Monster wrote on September 7th, 2011 at 18:43:

    OS is not a case. Firefox turned into complete crap in OSX as well as Ubuntu. Don’t wanna repeat all the complaints and issues, but I had most of them on multiple machines with multiple configurations starting from FF 3.x

    Maybe it’s my ‘user profile’ thing, I don’t give a shit anymore. Years of struggle and hope turned to be because of me deteriorating the situation, simply by casual browsing. I don’t wanna do anything with it, I’m just migrating to Safari – the best fully-functional browser so far, unfortunately not available in other OSs. Thankfully, my bookmarks have always been in the cloud.

    Firefox’s de-evolution and Mozilla staff’s arrogance sadly remind me recent downfall of Nokia when they started introducing creepier and creepier crap instead of new products and versions.

  35. some random user wrote on September 10th, 2011 at 02:54:

    @Cookie Monster:
    Where exactly was your struggle? Ok its a pitty that you had to learn how to use a new browser:) Have fun with libwebkit:P maybe you want to google for “libwebkit safari CVE”.

    And i am sure as hell that you did not contribute in any way still you insult people without having the slightes idea why some decisions have been made. having to deal with dumb, nonconstructive ppl like you enrages me.

    The mozilla guys give us a good and free browser you do not have to use it. and you have no right to act as if you payed for it so you can tell them how it has to look and feel.

    I have no crashes at all and the browsing seems overall better. Older versions work better on my old computers. But you surely do not complain about windows7 not running on your loved p75.

  36. Rob wrote on September 21st, 2011 at 06:47:

    @random user : Hear, hear!!

    FF5 wasn’t a problem in the Linux I use. If the ppl who sound off, spent 1/4 of the time looking for their own mistakes, they’d likely have smooth running system. Course just they get more of a kick out of ranting!

  37. Web Dev wrote on October 12th, 2011 at 05:26:

    Thanx to Firefox dev team, Firefox is getting worse and worse. What they have done with setTimeout and setInterval functions is nonsense

  38. F. Dotzler wrote on October 29th, 2011 at 11:47:

    Firefox 17 already? Just kidding. It’s arrogance and playing with numbers and a love for marketing first instead of quality first. It’s also another excuse for the “developers” to change things for no reason and break UI familiarity and “play” around with the software instead of keeping things consistent and efficient. Just because software can be changed doesn’t mean it should be. Stop chasing after the latest fancy “new” web “thing” and make the product consistent and do it right the first time instead of causing millions of people to have to “relearn” the “new” functionality and UI layout every 10 months. You firefox apologists are not listening to sound logic on this thread and the fact that reliability is way more important than fanciness and “features.”

  39. jeuxdotnet wrote on November 1st, 2011 at 10:27:

    Thanx to Firefox dev team, Firefox is getting worse and worse. What they have done with setTimeout and setInterval functions is nonsense

  40. Gary Brown wrote on April 25th, 2012 at 02:09:

    Been with FF since the beginning and have finally been forced to upgrade to FF12 for OSX. It is utter crap. Refuses to load new tabs about 50% of the time, slow and all my add- ons are disabled. Looking for a new browser as I can’t go back to the previous version.

    1. Jean-Yves Perrier wrote on April 25th, 2012 at 17:00:

      You should ask for help on the support site: . They will be able to help you fix the problems and find alternative for orphaned extensions.

      Also note that your add-ons will also not work in another browser: in both case you will have to find replacement. (I assume you were using Fx 3.6 and not Fx 5 like where you are posting).

      You’re lucky we noticed your comment. Usually posting a comment in a random post doesn’t help you match in getting help.

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