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Mozilla Firefox


Quick Specs

  • Version:
  • Total Downloads:
  • Date Added:
    Nov. 20, 2012
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  • Product ranking:
    #1 in Web Browsers

Editors' Review


Mozilla Firefox has undergone an enormous rebirth over the past two years. Since Firefox 4 debuted in March 2011, the browser has been hell-bent on improvements. These have come in large part on the rapid-release cycle, which sees a new version of Firefox every six weeks. Many people like them, but a vocal minority has pooh-poohed the increase in version numbers. That's hardly a legitimate complaint in a world where mobile apps also update silently and effectively, but the transition for Firefox hasn't been an easy one.

As you can see, Firefox is on version 17 at the time of this review. As a point of comparison, Chrome is currently on version 23 even though it only launched in 2008. The benefit of rapid updates, of course, is a browser that is safer and sleeker, with fewer problems because bugs get fixed on a regular basis.

The Firefox that you can download now is in the same speed category as its competition; offers many similar features (stronger in some areas and slightly weaker in others); includes broad, cross-platform support for hardware acceleration and other "future Web" tech and standards; and is a must-have for Android users (download for Android).

Recent changes have locked down memory leaks caused by add-ons, long browsing sessions, and heavy tab usage. The company released data showing huge gains in recovering memory with a shocking 150 tabs open, so you're likely to see big gains with far fewer.

In this version of Firefox, the Mozilla-developed Social API lets social networking sites hook directly into Firefox and provide persistent access to the service even when not on the social networking page. The feature is launching with Facebook Messenger, and works well if you're addicted to the service.

It's important to point out that there are four versions of Firefox available at the moment, and this review only addresses the stable branch, intended for general use. Firefox's other channels -- Firefox beta (download for Windows | Mac | Linux); Firefox Aurora, analogous to Google Chrome's dev channel (download Aurora for Windows | Mac | Linux); and the bleeding-edge, updated-nightly Firefox Minefield (download for all versions) -- are respectively progressively less stable versions of the browser, and aimed at developers.

Firefox installs quickly, your connection and hardware notwithstanding. There are no pop-ups asking you to register, and although an infobar link to Mozilla's Know your rights page at about:rights does appear, it's unobtrusive.

We're big fans of Firefox's rapid-release cycle. Initially wonky implementation has given way to a mature automatic update process. If you're on Windows, you'll be asked to agree to the User Account Control only when you install for the first time. Thereafter, the browser updates silently.

If you're installing Firefox for the first time, or installing after wiping all profile data, the browser will open to the new about:home Start page. It hosts a Google search box in the middle, and links to Downloads, Bookmarks, History, Add-ons, Sync, Settings, and Restore previous session at the bottom.

If you're updating Firefox from an older version, it checks your add-ons to see which ones you installed and which ones come from third-party vendors, such as security suite makers. The browser will ask if you'd like to disable any of these third-party add-ons. On top of that, all third-party add-ons are blocked from autoinstalling. Instead, you'll be presented with the option to allow them or block them on a per-case basis. This puts Firefox squarely on the side of the user.

We recommend that you set up Sync at this point, because it will allow you to synchronize and backup all your settings, add-ons, and personal browsing data. If you're extremely concerned about your data, you can set up Sync to work with your own server.

Careful Firefox observers will notice that the browser no longer ships with a separate icon for Safe Mode. Simply hold down Shift; when you click on the Firefox icon to open a box, you will be allowed to customize which settings carry over to Safe Mode.

Note that people coming to Firefox from version 3.6 or older ought to be prepared for a lengthier install time because of the significant code changes since then.

Firefox automatically installs a Windows 7 taskbar icon if you choose it as your default browser. Uninstalling the browser does not leave behind any icons or folders if you choose to remove your settings at the same time.

As PCs continue to be rocked by mobile devices, many traditional desktop programs have found minimizing interface chrome to be popular. Google's Chrome browser kicked off this trend in a big way, allowing Web sites to shine through, and while other browser vendors have done their best to go minimal differently, it's hard to not acknowledge the lineage.

Firefox does a good job of taking the concept of minimal and putting its own spin on it. It has small navigation buttons the same height as the location and search bars. The Home button has moved to the right side of the location bar. Tabs are on top for heightened visibility and maximize space given to the Web site you're viewing, while on Windows the control menus are hidden behind the orange Firefox button in the upper left corner.

Menu options have been spread across two columns, and while nearly all the submenus have been redesigned, the hot keys remain the same for a gentle learning curve. In fact, the menu redesign makes it much easier to get to bookmarks, add-ons, and history, as they now all live on one Menu pane. The Menu button is not available to Mac users, to keep with the Mac OS X theme.

In addition to the major changes to the menu, smaller changes have greatly improved usability. For example, there's now a Get Bookmark Add-ons link in the Bookmarks submenu. The History submenu now has Recently Closed Tabs and Recently Closed Windows sections.

Tabs are on top by default, and while the forward and back navigation buttons haven't moved, the stop and refresh buttons are now attached to the right side of the location bar, next to the bookmark star. When you're typing a URL, the Go button appears at the end of the location bar as an arrow. While resolving a URL, the box changes from the Go arrow to an X for the new Stop button. It might be hard for some to see since the traditional stop-and-go colors of red and green have been removed. You can customize the Firefox skin with the restartless Personas add-ons.

Right of the location bar lives the traditional search box, with its drop-down list of search engines. Above that on the tab bar there is a new button that lists all your open tabs, and you can add a button to access the Panorama tab-grouping feature. If you don't see the button, you can add it by right-clicking on the interface and choosing Customize, then dragging and dropping the Tab Groups icon next to the List All Tabs button. We don't consider many customizations to be essential, but this one is. The combination of tab grouping and Firefox's robust tab-memory management means you can keep open tabs around much longer than other browsers.

The Status bar that lives at the bottom of the interface is now hidden by default, again in keeping with the minimalist philosophy and the competition. There's a new Add-on bar as well, also hidden by default, to which extension icons can be added if you want to keep add-on icons easily available but out of the way of the main interface.

One of Firefox's singular strengths is its capacity for customization, which remains unparalleled and which is accessible even to novice users. While competing browsers do offer add-ons and extensions, Firefox remains far ahead of all of them in interface customization. And so, if you don't like the new interface, it's quite easy to revert it to an older style -- or just about any other look -- using add-ons and themes.

Features and support
Firefox is one of the most progressive major browsers available, an early adopter if not always an innovator. Its features cover the range of browsing essentials, from allowing you to heavily customize your browser while respecting your privacy, to giving developers the tools they need, to supporting the technologies that are driving the future of the Web.

One of the most important features in the modern Firefox is Sync. Sync smoothly synchronizes your add-ons, bookmarks, passwords, preferences, history, and tabs, not only with Firefox on other computers, but also with your Android version of Firefox. It's easy to set up, and if you're concerned about privacy, you can change sync to work with your personal server instead of Mozilla's. Firefox encrypts your data before sending it over an encrypted connection to its servers, where it remains encrypted. Mozilla says that the company would not be able to access it even if somebody there wanted to.

Tabs are a big part of browsing, and Firefox has the best tab management around. Thanks to recent memory-management improvements, you can now comfortably scale from two or three tabs to more than 100 without seeing a major performance hit over time. The aforementioned Panorama lets you group them out of sight until needed, and when you restart Firefox only the last open tab will become active. The others, while visible, won't load their content until you click on them. Panorama's groups let you label them which keeps organizational problems to a minimum.

The overall idea is to make it easier to switch from one tab to another, to group or regroup related tabs, and to get a global view of what's going on with your tabs. It's potentially a big improvement in browser usage, compared to aiming a mouse at a skinny tab, cycling through a list with Ctrl-Tab keystrokes, or pecking at a drop-down menu to reach the tabs that overflowed off into the deep.

Switch to Tab is a minor feature but incredibly useful. Open a new tab and start typing the name of an already-open tab, and the URL will appear in the drop-down with Switch to Tab beneath it. Select that one, and the new tab closes and you're whisked to the pre-existing tab. It's a great trick for cutting down on the amount of time it takes to sift through 45 open tabs, and removes the chance of accidentally having the same tab open twice or more.

You can also drag tabs around to reorder them, pin them as permanent "app tabs" next to the Menu button, or rip them off into their own windows.

Firefox add-ons have long been the brightest feathers in the browser's cap. While there are other more important browsing developments going on to close observers, add-ons remain important to the vast majority of people. The most popular Firefox add-ons have millions of users. The browser supports modern restartless add-ons, which install without needing to reboot the browser, as well as the legacy add-ons that helped drive its growth.

The add-on manager lets you search for add-ons without going to the external Mozilla Add-on Web site. You can create collections of add-ons to share in the Get Add-ons tab, navigate backward and forward through add-on searches, and as mentioned in the Installation section, it blocks add-ons from installing without your approval.

The Bookmarks and History menus, and Download Manager, leave a bit to be desired. They're not bad, but it's clear that they could use some redesigning when compared to the competition. We'd like to see them appear in their own tabs, as they do in Chrome, instead of in separate pop-up windows.

The location bar -- or as Mozilla calls it, the Awesome Bar -- retains familiar features, such as the options to search your history and bookmarks and to tap into your default search engine to provide you with quick results, without having to use the search box.

The "identity block," the colored leftmost section of the URL, has been given a refresh to better call out the Web site you're on. The URL bar itself now changes the text color of the URL you're on so that the domain is black, for easy identification, while the rest of the URL is gray. This sounds small but is important, since it's a strong visual cue to help you avoid getting spoofed.

Also on the security front, Firefox was an early adopter of Do Not Track, which indicates via a header notification that you want to opt out of targeted advertisements. However, it requires that the Web site you're viewing, and therefore that site's developers, respect the header itself. While this is great for future-proofing the Web, not many Web sites have taken notice of it. That doesn't mean it won't eventually have a big impact, but that time is not now, and it's better to install an add-on like Adblock Plus or Do Not Track Plus to get more complete ad-tracking protection.

The Content Security Policy blocks one of the most common types of browser threats, cross-site scripting attacks, by allowing sites to tell the browser which content is legitimate. Though CSP also places the burden on the sites' developers, it's backward-compatible and aimed mostly at well-known sites hosting immense volumes of data and content.

Another security improvement is the implementation of HTTP Strict Transport Security (HSTS) and Google's SPDY protocol. HSTS prevents your log-in information from being intercepted by telling Firefox to automatically create a secure connection to a site's servers, while SPDY will load supporting sites like and faster and safer because it forces SSL encryption for all connections.

Plug-ins like Adobe Flash and Apple QuickTime have now been protected by click-to-play blocklisting automatically. This prevents out-of-date plug-ins from loading without your permission.

Under the hood, Firefox supports full hardware acceleration across all platforms, which means that the browser draws on your graphics card to speed up complex rendering. You'll see dramatic HTML5 support, including for high-definition WebM video, and broad support for the HTML5 canvas, video, audio, geolocation, drag and drop, and form tags. OpenType fonts are supported, as are CSS3 and newer JavaScript values. WebGL and hardware acceleration give the browser a massive boost, which we'll discuss in the Performance section below.

A new Web Developer menu collates tools for building and debugging Web sites in one location. One such is the ScratchPad tool, which browsers like Opera and Chrome have had for some time. It allows developers to test JavaScript and CSS before implementing it. The Web console feature also has a new autocomplete option and can have its location customized. Another dev tool, unique to Firefox, is a 3D visualizer called Tilt, that lets developers see in real time how their code will render on the site.

Firefox is on the cutting edge of the next generation of Web standards, and that benefits you immensely by offering faster rendering times of Web sites that can do more.

Firefox 15 introduced a series of memory-management improvements that dramatically increase the stability of the browser. These changes, covered by the internal Mozilla moniker MemShrink, basically mean that the browser can handle a huge number of tabs and add-ons longer than before. The current Firefox 17 is eminently stable.

As mentioned earlier, the browser's overall performance has been greatly improved by tying performance to the graphics processing unit (GPU) hardware acceleration. This allows the browser to shove certain rendering tasks onto the computer's graphics card, freeing up CPU resources while making page rendering and animations load faster. The tasks include composition support, rendering support, and desktop compositing.

JavaScript plays a major role in the modern Web, and changes to the JaegerMonkey engine combined with the GPU acceleration give the browser some serious juice. Ongoing improvements in browser technology make regular browser testing a challenge, but March 2011's browser benchmark battle placed Firefox 4 ahead of Chrome 11 and Internet Explorer 9. It wouldn't be surprising to find that Chrome and Firefox currently test much closer to each other because of their regular updates.

CNET Labs will have an update to our performance benchmarks in the coming weeks. For now, our most recent numbers are from March 2011, when Firefox 4 was released.

One interesting publicly available benchmark is JSGameBench from Facebook, which looks to test HTML5 in real-world gaming situations. JSGameBench hasn't posted new results since April 2011, but the ones it did post gave strong marks to the Firefox 4 beta both with and without WebGL. The stable version of Firefox 4 also did well in JSGameBench tests once it was released.

Note that to effectively use hardware acceleration, you must make sure that your graphics card drivers are up-to-date.

Browser benchmarks are a notoriously fidgety lot, and often come up against legitimate complaints that they look at too narrow a set of features -- such as checking only JavaScript rendering times. In hands-on use, at least, Firefox 17 can more than hold its own. It's not clear that it's enough to counter the past three years of Chrome decisively winning the fastest-browser PR campaign, but that may no longer be the point. All five major browsers are now similarly fast at JavaScript tests, and you may want to start looking at other criteria to determine which browser is best for you.

Firefox has plug-in crash protection, which prevents plug-ins like Adobe Flash, Apple QuickTime, and Microsoft Silverlight from causing the browser to drop dead. If one of them crashes, simply reload the page.

Firefox is in an unusual position as the modern Internet stands on the precipice of the second phase of the digital age. As the world prepares for high-powered, always-connected smartphones to dominate, one of the most competitive and forward-thinking browsers comes from an independent nonprofit company.

Firefox's open-source approach and recent developer tools improvements means that the people designing your favorite sites will come back for more, while Mozilla's investment in pushing open Web standards means that the Web has a powerful, noncorporate advocate. Despite the heavy competition from Google, Microsoft, and Apple, and as long as it avoids stagnating, Firefox will have a bright future ahead of it.

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User Reviews
  • Current Version


    out of 15 votes

    • 5 star 8
    • 4 star 2
    • 3 star 0
    • 2 star 1
    • 1 star 4
  • All Versions


    out of 15646 votes

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Results 1–10 of 15

1 stars

"Something is very wrong with version 17"

December 01, 2012  |  By charliejh

2012-12-01 12:22:46  |  By charliejh

 |  Version: Mozilla Firefox 17.0


I am a Firefox fan as it has everything you could want in a browser BUT....


I have a brand new windows 8 computer that is fast in IE-10, Google Chrome but very slow to load web pages when using Firefox 17. As in previous versions of Firefox it slows down when trying to load web pages. If Chrome and IE-10 load fast then why doesn't Firefox?


I would use everyday if I had the speed it claims it has.

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5 stars

"Continue not to notice an differences; five stars!!"

November 30, 2012  |  By Bobs415

2012-11-30 03:43:14  |  By Bobs415

 |  Version: Mozilla Firefox 17.0


Easy to use and navigate. Ample add-ons. Does the job I expect it to. I do not normally see any "ah-ha's" with this browser, which in my opinion makes it good! Seemless updates.


Haven't noticed any to speak of.


Keep on doing what you're doin!!

Updated on Nov 30, 2012

"ANY" (sorry)

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5 stars

"A fast, intelligent, excellent browser"

November 30, 2012  |  By tomstars

2012-11-30 02:03:16  |  By tomstars

 |  Version: Mozilla Firefox 17.0


I have used most browsers including IE, Opera, Maxthon and Chrome.
Firefox hands down blows them all away. Why is FF great? Speed. It is consistently the fastest browser by far. It is also extremely customizable. You can make it look and act exactly how you like and a lot of this customizing ability is built in to the browser. You can also select from a huge assortment of add-ons.

I also like that I can have a unique search field separate from the URL field. The favorites button allows you to add favorites and also lists all the favorites all from the same click (chrome should get a clue here).

I was an IE fan for a while until they changed the browser to include a combo url/search field that can't handle email address searches. Chrome does it better but lacks an intelligent favorite button design (one click add favorites and list favorites) and honestly does not seem all that fast.

Firefox is updated frequently and seems to always get a little faster each time.


Not much. I do have a friend that when he closes FF sometimes the process remains and he has to launch task manager to close it so he can relaunch the browser. I haven't experienced this much.

Overall I'd rate Firefox excellent in every way.


Very fast, customizable, intelligently designed and updated frequently, it it the best browser available.

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5 stars

"one an only"

November 29, 2012  |  By sylentz

2012-11-29 13:09:58  |  By sylentz

 |  Version: Mozilla Firefox 17.0


it the best yet


bone as come to mind


the best browser ever made

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4 stars

"Works fast, works well."

November 28, 2012  |  By suwanavi

2012-11-28 12:13:19  |  By suwanavi

 |  Version: Mozilla Firefox 17.0


Very fast. Easy to use interface. Memory efficient.


doesn't import all of bookmarks


A nice browser option.

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1 stars

"Still not impressed"

November 28, 2012  |  By gorge548

2012-11-28 10:33:35  |  By gorge548

 |  Version: Mozilla Firefox 17.0


Better than IE, but worse than Google Chrome. Ease of use. They were the first to come out with Tabs.


I can never get videos such as YouTube to work without locking up my computer. Older versions of Firefox allowed AUTO FILL. Too many updates.


I used Firefox for years and considered it the best browser. I encouraged my friends to use it and they liked it much better than IE. No more. Now I'm telling my friends to switch to Google Chrome. Faster and never any problems. Also allows Auto Fill and doesn't lock up when I play a video.

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4 stars

"Seems to work, no different to earlier versions."

November 28, 2012  |  By colintivy

2012-11-28 07:06:09  |  By colintivy

 |  Version: Mozilla Firefox 17.0


Fairly quick, stable and intuitive.


Nothing that I can see!

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5 stars

"I am very happy w/ FF"

November 28, 2012  |  By ladiIII

2012-11-28 06:44:16  |  By ladiIII

 |  Version: Mozilla Firefox 17.0


I won't go near IE. I love FF.


I only wish FF would resolve the issues that make it incompatible w/ virtual account numbers from Citibank.

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5 stars

"Huge improvement in loading times"

November 28, 2012  |  By DaDreamWizard

2012-11-28 05:26:23  |  By DaDreamWizard

 |  Version: Mozilla Firefox 17.0


I use both Firefox & Chrome. More advantages with Firefox and was more speed with Chrome. Well everything just flipped a switch for me. Firefox now started and loaded quicker then Chrome. Not only the speed, I feel there's additional stability under the hood but I can't put a finger on it.


at the moment, uh..... let me think.....

still thinking....

guess not.


I stress the browsers I use more then an average normal user would. My browsers can open with 13 pages or more at times, and sometimes with 2 windows, even 3 (not often).

It was weird. After using Firefox and noticing something was different I figured it was cached luck. Then I started up what I thought to be the faster browser to find myself tapping my fingers, I look up thinking I clicked the wrong icon. I repeated this browser startup at least 5 times back and forth.

Amazing what a little? programming savvy can do. Yo, Mozilla, what took you so long?

Nice............ Glad I never dropped ya as I have others.

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5 stars

"FAST and BEAUTIFULL(if you install some nice'personas')"

November 25, 2012  |  By salesalex

2012-11-25 17:11:09  |  By salesalex

 |  Version: Mozilla Firefox 17.0


-easily adding a search provider when site has that option is the thing which I like the most of all = I have added CNET as a search provider and it is cool =I just do one click to change search provider then mark some text + right click on it + searh via CNET= voila ,it opens CNET page which matches that text.And that works for youtube ,wikipedia and every decent site.

-very cool feature is add,remove or replace the default icons on mozilla's interface,just right click near some icon and click on 'settings'.

-you can change HOME page into every one you want(google,bing etc.)


1.I must update adobe flash plugin and MOZILLA FIREFOX manually ,but I think that is better that way .


1.haters of MOZILLA are either lazy or very ignorant people. my ''pros''

Updated on Nov 26, 2012

I think that 'TAB MIX PLUS' add-on is not secure thing (it is spyware or adware) and that is the reason that MOZILLA left it behind. If you want to open like ten or more pages automaticaly when F.F starts you should do next: 1.Make'favorites bar' always visible 2.make new folder on it 3.drag and drop in it every bookmark that you want on start on big orange button-go to options window and click on the left button the 'my first page' just click 'use bookmark' - find it - click on it - OK - save - restart FIREFOX -and wait for some time for pages to load (depending on your internet speed). And btw. I don't think that people who use MOZILLA are it's haters .

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Results 1–10 of 15

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Full Specifications

What's new in version 17.0

--First revision of the Social API and support for Facebook Messenger

--Click-to-play blocklisting implemented to prevent vulnerable plugin versions from running without the user's permission

Publisher Mozilla
Publisher web site
Release Date November 20, 2012
Date Added November 20, 2012
Version 17.0
Category Browsers
Subcategory Web Browsers
Operating Systems
Operating Systems Windows 2000/XP/2003/Vista/7/8
Additional Requirements None
Download Information
File Size 41.06MB
File Name Firefox Setup 44.0.exe
Total Downloads 48,877,667
Downloads Last Week 34,339
License Model Free
Limitations Not available
Price Free

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