Mozilla announces Firefox 4 Release Candidate

After 12 betas (13 if you used the nightly builds), Mozilla have finally signed off Firefox 4 as a Release Candidate and made it available for download.

In a posting on the Mozilla blog they announced that;

Mozilla Firefox 4 for Windows, Mac and Linux has exited the beta cycle and is now available as a release candidate in more than 70 languages. The millions of users testing Firefox 4 will be automatically updated to this version and will join our Mozilla QA team in validating the new features, enhanced performance and stability and HTML5 capabilities in Firefox 4.

Mozilla have also encouraged testers to put the browser through its paces by visiting the Web O’ Wonder which features cutting-edge demos targeted for Firefox 4. Developers are also invited to submit their own demos to the Mozilla Developer Network Demo Studio.

The Mozilla team also claimed they have fixed more than 8000 bugs since the first beta, putting into perspective the huge task undertaken, and why there were so many beta versions needed.

Firefox 4, based on the Gecko 2.0 engine, brings an updated user interface, new ways to organize tabs, a revamped add-on manager, support for HTML5 video standards, multitouch support on Windows 7 and a range of performance and security enhancements.

You can grab Firefox 4 here.

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117 Comments

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Using it right now, is the little orange button in the top left a Windows only feature? The Linux version doesn't have it.

looking good, but they recently updated the tabs layout in a minefield build which puts the tabs at the very top of your monitor, similar to chrome's tabs. hopefully this change will be made in the final??

jasonon said,
looking good, but they recently updated the tabs layout in a minefield build which puts the tabs at the very top of your monitor, similar to chrome's tabs. hopefully this change will be made in the final??

Isn't it like this when you go fullscreen in the RC?

It's pretty good, I switched back to FF from Opera. Now, if only there was a way to stack tabs like you can in Opera.

Boeing 787 said,
Firefox 4 is definitely improved. I like the speedy launch. I hope Firefox 5 is developed quicker.

It will be. =) Their plan is about 3 months, so in Mozilla terms maybe 5-6 months?

I was looking forward to this.... but as soon as I open it, it immediately goes to not responding and consumes 26% CPU usage.

stablemist said,
so fx4 RC is bug free? because I remember reading that Mozilla only had 1 bug left to get rid of.

The bug left is about blacklisting the mcafee site advisor addon which claims to be compatible with FF4 but stucks up the browser.

day2die said,
I wonder if Mozilla will rush to launch Firefox 4 on March 13, a day before Internet Explorer 9 launch.

i actually wonder too, as IE9 isnt FF's competition.... Chrome is and they upgraded yesterday or something?

Shadowzz said,

i actually wonder too, as IE9 isnt FF's competition.... Chrome is and they upgraded yesterday or something?

Agree.

2008: Internet Explorer vs Mozilla Firefox
2011: Internet Explorer vs Google Chrome

day2die said,
I wonder if Mozilla will rush to launch Firefox 4 on March 13, a day before Internet Explorer 9 launch.

Dont count on it.. the QA team said they need 1-2 weeks to finish testing before a final release.

day2die said,

Agree.

2008: Internet Explorer vs Mozilla Firefox
2011: Internet Explorer vs Google Chrome


Nah, Chrome barely ate away IE's market share. Most people who switched to chrome, where already using an alternative browser.
and with the release of IE9 and MS fanboyism returning... doubt IE will lose any market share t he next couple of years.

Memnochxx said,
Bug fixes don't make a new major version.
Bugs in these terms mean changes, not fixes for broken things - which is just a small part of it.

blahism said,
hope they fix the printing issues i had.. i don't print much and when i do, its important it works

i am sure they have as i believe i seen it mentioned before. but if the printing did not work i could not see them releasing the browser as that would probably qualify as a showstopper bug.

Jonessie said,
Mine just updated automatically. Nice to see that Mozilla got their foot through the door before Microsoft.

Huh? IE9 went to RC a month ago.

Jonessie said,
Mine just updated automatically. Nice to see that Mozilla got their foot through the door before Microsoft.

Internet Explorer 9 RC was released a month ago.

Jonessie said,
Mine just updated automatically. Nice to see that Mozilla got their foot through the door before Microsoft.

Only as far as inline updates (IE9 RC was out the door in February).

Here's a weirdie - Firefox 4b12 for OS X *did* offer an inline update to the RC, which the Win32 version didn't. (The inline update was a mere 3 MB. A great deal smaller than the 12 MB full-tilter that the Win32 RC weighs in at.) Again, there is no beta-RC-whatever branding anywhere within the browser itself. (It just says Firefox 4.0.)

Have the Linux-based Firefox testers weighed in? (So far, I have not seen inline updates offered in any Linux-based version of Firefox 4 beta - will the RC buck that trend?)

Temuulen Battumur said,
Uninstalled 4.0 Beta 12. Install RC.

Definitely felt improvement.


Firefox RC installs to a different folder anyway

Temuulen Battumur said,
Uninstalled 4.0 Beta 12. Install RC.

Definitely felt improvement.


Firefox RC installs to a different folder anyway

DARKFiB3R said,
Still a memory sucking mofo. The love hate relationship continues.

6 tabs and memory >300k, how a bout you mate?

I will keep monitoring.

kuti said,

6 tabs and memory >300k, how a bout you mate?

I will keep monitoring.


0,3mb? i really want to know how you do that, seems impossible to me.
Just freshly installed it and the 2 default tabs it runs at 59.740kb.

still less then FF3 tho

DARKFiB3R said,
Still a memory sucking mofo. The love hate relationship continues.

it's still not as bad as it was prior to BETA 12 as the RAM use shot up to 350-400MB+ fairly quickly prior to BETA 12 but BETA 12 definitely helped on RAM use to a noticeable degree. but ill have to keep testing RC.

now my browser's (Firefox 4 RC) been open for a few hours and loading random sites etc and my current RAM use with 7 tabs open is about 260MB.

ill see if it climbs higher because Firefox should never really NEED to use more than 300MB if you ask me with a fair amount of tabs open.

DARKFiB3R said,
Still a memory sucking mofo. The love hate relationship continues.

Well after more testing... browser still open since last post with 7 tabs open... ram use right now is 240MB. so it appears they seem to float in the 250MB area for the most part after using Firefox a while and it gets loaded up on RAM. so if it stays roughly like this for the next day or so it's going to be a clear improvement over Firefox 4 BETA 12 in RAM usage.

and i was using my browser a decent amount over the last several hours.

p.s. i got NoScript/Download statusbar/download helper/FireGestures v1.6.1/ad-muncher browser extensions. those are basically the only extensions i got installed for Firefox which is pretty much 4 of them.

also got newest Flash v10.2.152.32 and Windows Media Player Firefox Plugin to support .wmv video files online.

ThaCrip said,

Well after more testing... browser still open since last post with 7 tabs open... ram use right now is 240MB. so it appears they seem to float in the 250MB area for the most part after using Firefox a while and it gets loaded up on RAM. so if it stays roughly like this for the next day or so it's going to be a clear improvement over Firefox 4 BETA 12 in RAM usage.

and i was using my browser a decent amount over the last several hours.

p.s. i got NoScript/Download statusbar/download helper/FireGestures v1.6.1/ad-muncher browser extensions. those are basically the only extensions i got installed for Firefox which is pretty much 4 of them.

also got newest Flash v10.2.152.32 and Windows Media Player Firefox Plugin to support .wmv video files online.

I have a serious tab addiction that I am constantly battling, my ram usage is way higher than that

http://gyazo.com/57383f622d08a65eed3baafab34cdfda.png

I suppose nobody in there right mind should have 100 tabs open lol *must learn to focus*

i'm afraid, I may have to live with IE9 and its flaws because IE is way faster.. and at the end of the day that outweighs the few advantages firefox still has in comparison.. but I'll wait and see if I can really get used to IE after years of using firefox..

srslykev said,
i'm afraid, I may have to live with IE9 and its flaws because IE is way faster.. and at the end of the day that outweighs the few advantages firefox still has in comparison.. but I'll wait and see if I can really get used to IE after years of using firefox..

Maybe you should just get a better computer, really IE9, chrome and firefox all run around the same speed for me.

srslykev said,
i'm afraid, I may have to live with IE9 and its flaws because IE is way faster.. and at the end of the day that outweighs the few advantages firefox still has in comparison.. but I'll wait and see if I can really get used to IE after years of using firefox..

What's IE flaw?

I've been using IE9 as my daily driver and haven't seen any issue (except on Neowin).

Gaffney said,

Maybe you should just get a better computer, really IE9, chrome and firefox all run around the same speed for me.

Not everyone can afford a high end gaming rig like yours.

day2die said,

What's IE flaw?

I've been using IE9 as my daily driver and haven't seen any issue (except on Neowin).

And I have no reason to believe that the issue with Neowin is anything other than a some-time quirk. I know which issue is being referred to, and I *sometimes* suffer from it with IE9 RC - however, it's more common for me to get hit with it in other operating systems (none of which even has IE installed), such as OS X 10.6.7 (in Firefox 4 beta 12, incidentally, which is where I was plagued with it last).

Gaffney said,

Maybe you should just get a better computer, really IE9, chrome and firefox all run around the same speed for me.

I do have a pretty fast computer and that's definitely not the problem. No matter what PC I use, IE starts (!) way faster than Firefox.. Once it's already started, there is no real difference.. but starting the task takes seconds! And that really annoys me..
And by flaws I mean the lacking of costumization and certain features like autocorrect while tiping in forms.. I don't wanna give that up but the new IE does have its benefits.. Speed, Design, OS Integration,...

Another thing, why don't Opera and Mozilla, make their brand buttons like Backstage in Office 2010 which is actual tab with links to various settings?

Mr. Dee said,
I guess this mean 12 or 13 RC's?

No idea. However, I do notice the distinct *lack* of RC-branding anywhere in the browser itself. Also, for some rather odd reason, I could not update to the RC from within beta 12 (despite it using beta 12's folder and other settings by default).

Apparently, within-browser updates has been preserved, though. (Go-go-inline updating!)

RC1 is holding up pretty well so far, it may go final.

You may not have had an internal update to RC1 because it wasn't released.

No, RCs do not have RC branding, because they are RCs. That is, they are supposed to be candidates for release.

Love it after updating from 3.6.15, but dislike the fact that the "new tab" button is no longer is in the toolbar customization menu. I need that button right over here for my clean setup that I use: http://i.imgur.com/6t7Fy.jpg

Anyone knows a way to return it?

Pupik said,
Love it after updating from 3.6.15, but dislike the fact that the "new tab" button is no longer is in the toolbar customization menu. I need that button right over here for my clean setup that I use: http://i.imgur.com/6t7Fy.jpg

Anyone knows a way to return it?

wtf?! they've removed that button?? that's annoying...

Bhav said,

wtf?! they've removed that button?? that's annoying...


Yeah, they did. Only the "new window" button is left, which I never use.

Too late to edit, but the "problem" was solved. The button was hidden in "menu bar", which I disabled after I moved all my buttons from there from my previous setup (which involved tinymeu, that's now yet doesn't work with FF4) and left it there by accident (because of the stupid transparency).

Carry on

torrentthief said,
right click the toolbar, choose customise then move the new tab button from the right of firefox and drag it to where you want it.

Here is mine: http://img687.imageshack.us/img687/3623/ff4d.jpg

Thanks! I never realized you can move the new tab button on the tab bar. I have "always show the tab bar" off and had no way of opening a new tab now that they took the other new tab button away. I was seriously considering sticking with FF 3.6 because of this.

Now if only they would stop copying chrome! I like the status bar always visible. Now the status bar and add-on bar take more space. Bad move Mozilla!

Oh, and what happened to the colors on the buttons?
http://localhostr.com/files/1SripYC/ff4.png
Another step backwards!

Using a portable version of RC1 for testing here. Not ready to upgrade just yet.

DarkSim905 said,

I'll never understand why people blur tabs/icons, etc. Guess some of you are more elite than the rest of us.


Or maybe he was using his browser for work, which might involve NDAs or trade secrets in general? (Or it could just be porn!)
Either way, there are reasons for blurring tabs other than to be "elite."

littleneutrino said,
already installed and running rather nicely

Agreed so far - it seems that they actually *improved* on beta 12's performance (at least in Windows x32). Tomorrow it's on to the real meat-and-potatoes tests (for me) - on OS X 10.6 (where the Fox is the default, replacing Safari in that role).

For some reason whenever i open the RC, it wont work.

Wont let me click on anything and displays the browser is working in offline mode page for some reason...Help?

Ci7 said,
hhmmm

they might as well call it FF forever (DNF )

Hahaha, I think that would be pretty awesome if they did that, and might help ease the tension around Mozilla lately, showing that they acknowledge their delays, but with a sense of humor

iamawesomewicked said,

Except the acronym for Firefox is... Fx not FF


First I have heard of Fx, everywhere in the universe I goto uses FF.

Ugh, really? We need to be corrected on appropriate abbreviations? Appropriate abbreviations are ones you can understand. No one seems to have an issue comprehending what FF means.

If you do though, may I ask that you also look up what FU might stand for.

dead.cell said,
Ugh, really? We need to be corrected on appropriate abbreviations? Appropriate abbreviations are ones you can understand. No one seems to have an issue comprehending what FF means.

If you do though, may I ask that you also look up what FU might stand for.

It's not spelled FireFox.

iamawesomewicked said,

It's not spelled FireFox.


Nor is VW spelled VolksWagen, nor AOL spelled America On Line. Fx is a stupid abbreviation on account of both capitalization and choice of letter.

Memnochxx said,

Nor is VW spelled VolksWagen, nor AOL spelled America On Line. Fx is a stupid abbreviation on account of both capitalization and choice of letter.
If you say FX fast enough you can get away with ****s.

Memnochxx said,

Nor is VW spelled VolksWagen, nor AOL spelled America On Line. Fx is a stupid abbreviation on account of both capitalization and choice of letter.

Don't call me out on it. It's Fx. Officially.

Shadowzz said,

the majority uses FF as the abbrevation. So how about we just stick with that?

If they wanna keep calling it by the wrong abbreviation then that's there choice

Shadowzz said,

the majority uses FF as the abbrevation. So how about we just stick with that?

I like to use Firefox for Firefox I know it's a waste of time actually typing out whole words, but that's how I roll.

iamawesomewicked said,

If they wanna keep calling it by the wrong abbreviation then that's there choice

"FF" makes far more sense than "FX" and is more commonly used from what I've seen, too.

Fire - one syllable
fox - second syllable
Hence "FF"

Hardcore Til I Die said,

"FF" makes far more sense than "FX" and is more commonly used from what I've seen, too.

Fire - one syllable
fox - second syllable
Hence "FF"

Umm, guys? Don't you have anything better to do than argue over a stupid abbreviation? :-)

Bogdan Calapod said,

Umm, guys? Don't you have anything better to do than argue over a stupid abbreviation? :-)


nope, why would we otherwise be on neowin?

Bogdan Calapod said,

Umm, guys? Don't you have anything better to do than argue over a stupid abbreviation? :-)

Neowin is for people like us who would much rather harshly criticize a comment than agree. We also settle for a lot of late news. Neowin isn't quite right. I've read things on Ars then 4 days later here.

Still like it though. Filled with nasty sarcasm.