Icon of Mozilla Firefox 27.0.1

Mozilla Firefox

  • Windows
  • Version 27.0.1
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Mozilla Firefox

  • Windows
  • Version 27.0.1
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Voters: 15458


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Mozilla Firefox is a free open-source web browser produced by the Mozilla Corporation available since 2004. It is available for use on Microsoft Windows, Mac OS X and Linux platforms. Firefox has 23% of the market share among web browsers which makes it the third most popular browser after Google Chrome and Internet Explorer. It is available in 88 languages.

The installation file is a solid 17 MB. Among other questions, the installer asks if you would like to allow the Firefox maintenance service. This service updates Firefox without having Windows User Account Control (Windows Vista and afterwards) ask for permission first. Otherwise, installation is generally fast and glitch-free. The appearance is somewhat minimalist with the browser taking up a lot less screen space than in the past. Only the Back
and Forward buttons are located in their regular places while the Refresh button is located in the Address Bar and the Home button is located at the end of the dedicated search bar. It is not immediately apparent if any increased functionality is derived from such strange placement, but needless to say, users will either have to get used to this unorthodox arrangement or rearrange it themselves.

Mozilla Firefox wasn’t the first browser to introduce tabbed browsing, but it was the first that exposed the feature to such a wide cross-section of people. Tabbed browsing features are now common to most if not all browsers. New tabs display thumbnails of recent and frequently visited sites which is quite convenient. You can choose to bookmark all open tabs or open all tabs in a folder. If Firefox’s native tab options are not enough for you, extensions like Tab Mix Plus offers a lot more capabilities.

One of the features that has been particularly attractive to Firefox users is the wide array customizations that is available to users. Firefox’s enthusiastic bunch of fans have created extensions for virtually any purpose you can imagine. The list is far too extensive to explore here, but can greatly improve their productivity and browsing experience by adding a few good additions. Also, as noted before, Firefox isn’t the slickest-looking browser, but there are
themes available that can put a better-looking front on your browser. Firefox users can also add search engines to the browser’s dedicated search bar. However, there are extensions that can have a negative effect on your browser’s performance so it’s always a good idea to read reviews and monitor your browser’s behavior after installation.

Like other browsers, Firefox also offers a variety of helpful features like Private Browsing, Firefox Sync. It also has an Instant Website ID to help decrease the chances for phishing. The Awesomebar, Firefox’s cure for the common address bar, will help you search while you type. This feature is much less functional than Chrome’s address bar however, since Firefox’s
Awesomebar only searches your bookmarks and history.

One of the issues that Firefox has wrestled with is its large memory usage which has been consistently high. Although efforts have been made in the past to decrease the size of its footprint subsequent editions have failed to properly address the issue. Thus this version of Firefox still weighs heavily on memory resources.

Mozilla Firefox was once considered the rightful heir to the browser empire headed my Microsoft’s long-reigning Internet Explorer. However, sluggish and quirky behaviour has seen Google Chrome usurp Mozilla Firefox. However, there are still lots of positive things to say about the browser that sparked the exodus away from Internet Explorer.


  • FIXED: 27.0.1 - Fixed stability issues with Greasemonkey and other JS that used ClearTimeoutOrInterval
  • FIXED: 27.0.1 - JS math correctness issue
  • NEW: You can now run more than one service at a time with Firefox SocialAPI, allowing you to receive notifications, chat and more from multiple integrated services
  • CHANGED: Enabled TLS 1.1 (RFC 4346) and TLS 1.2 (RFC 5246) by default
  • CHANGED: Added support for SPDY 3.1 protocol
  • DEVELOPER: Ability to reset style sheets using 'all:unset'
  • DEVELOPER: You can now choose to deobfuscate javascript in the debugger
  • DEVELOPER: Added support for scrolled fieldsets
  • DEVELOPER: Implemented allow-popups directive for iframe sandbox, enabling increased security
  • DEVELOPER: CSS cursor keywords -moz-grab and -moz-grabbing have been unprefixed
  • DEVELOPER: Added support for ES6 generators in SpiderMonkey
  • DEVELOPER: Implemented support for mathematical function Math.hypot() in ES6
  • HTML5: Dashed line support on Canvas
  • FIXED: Get Azure/Skia content rendering working on Linux
  • FIXED: Various security fixes

Full Specifications


Publisher web site
Release date
February 14, 2014
Date added
February 14, 2014



System requirements

Operating systems
Windows, Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 2003, Windows 8,

Download information

File size
24 MB


Total Downloads
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Jeremy C.
Jeremy Cocker
  • + Fully extensible
  • + Dedicated search bar
  • - Resource hungry
  • - Awesomebar is less impressive than Chrome’s

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