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Firefox for AndroidRelease Notes

Take your Firefox anywhere. Firefox for Android is built on the same technology platform as Firefox for desktop computers, just optimized for browsing on a mobile device. Check out the new and improved features, known issues, and frequently-asked questions.

As always, you’re encouraged to provide suggestions to improve Firefox for mobile or file a bug in Bugzilla. If you need help, go to the Firefox Mobile support website.

What's New in Firefox for Android

The latest version of Firefox for Android has the following changes:

  • Fixed a rare issue where some users could find one or more of their add-ons hidden after a Firefox update (see the blog post)

The previous version of Firefox for Android introduced the following changes:

  • Copy & Paste - Text selection in web content: Long tap in a web page and start selecting text using the familiar Android-style drag handles. This was a top request by Firefox users
  • Added a ‘Quit’ action to the Android menu: exit the browser with one tap. When you restart Firefox, you can quickly continue where you left off by restoring all or individual tabs from your previous session. This was another very frequent feature request from mobile Firefox users
  • Use Firefox in your language: When Firefox starts for the first time, it detects the language setting of your Android device and automatically switches to that language, if Firefox supports it. You can switch Firefox to a different language with a single tap
  • Improved image rendering on Tegra-based tablets and phones (see bug 669851)
  • The WebSocket API is now available in Firefox for Android (see bug 537787)
  • Firefox for Android is built on the same rendering engine as Firefox for desktop computers. Please see the Firefox release notes for additional relevant changes
What's New with Add-ons

There are now over 160 add-ons for Firefox for mobile, and counting. Thanks to our awesome community, the number of exciting compatible add-ons increases constantly.

If you are a developer: Now is the time to extend your reach and build a new awesome add-on, or to make your mobile add-ons compatible with Firefox for Android. Find all the tools and resources you need on the Mozilla Developer Network. Existing add-on developers can find more information about the specific changes in this version on the Mozilla Developer Network. Please see the features from previous releases to see what other technologies are available for add-on developers.

For Developers

Firefox is an easy and open development platform to build fast, powerful and beautiful mobile web apps and add-ons. Use the latest web technologies like HTML5, CSS and JavaScript to innovate faster, more easily and extend your reach. You can build great sites and apps by tapping into the device capabilities of the phone, as well as create game changing add-ons. Visit the Mozilla Developer Network to learn more about how you can build and showcase your innovations on millions of devices.

Build Add-ons for Mobile

Although Firefox for the desktop and mobile are built on the same technology platform, there are differences that will require developers to make changes to their add-ons in order to become compatible with Firefox for Android.

With this new release we now support Restartless Add-ons. Visit the Electrolysis and Add-ons wiki page and the Add-ons Training Week documentation to learn more.

What’s Under the Hood
  • The same browser engine as Firefox for desktop
  • Fast JavaScript engine, using Mozilla’s JägerMonkey just-in-time compiler
  • Leading web standards compatibility
  • Optimized for ARM processors
  • Location-Aware Browsing
HTML5 and other web standards:

In addition, Firefox for Android supports:

Known Issues

This list covers some of the known problems with Firefox for Android which will be resolved in future versions:

  • Layout issues with Google+ and other Google properties: some recent changes in the Google layout and CSS may cause issues in non-webkit browsers like Firefox. We are working with Google on the problem (see bug 668218 and bug 668288)
  • The Swiftkey X input method can cause some character duplication issues when using "backspace" (see bug 672661)
  • blinking characters in form fields (see bug 665374)
  • Asus Transformer keyboard deletes two characters (see bug 662219)
  • Asus Transformer hardware keyboard is always en-us (see bug 669361)
  • Unable to zoom in/out a webpage on header/footer when a double tap gesture is made (see bug 639504)
  • Sync Now button is active even if the Sync is in progress (see bug 656594)
  • Searches from the URL bar do not function reliably for some locales (see bug 645970)
  • We found an extremely rare case where the browser may become unable to load web pages or close tabs. This should not happen in normal operation (see bug 676780), but we are working on a solution. Clearing the browser profile (Settings -> Applications -> Clear Data) resolves it, but may remove useful browser data like bookmarks and web history. Recommendation: use Firefox Sync for a seamless web experience across all your devices that run Firefox
  • For some users HTML5 video may load slowly and display rendering artifacts on the screen during playback (see bug 622839)
  • Reloading a page increases the zoom level (see bug 628269)
  • Users who have a large desktop profile using Firefox Sync may see some performance issues during the initial sync process
  • Adobe Flash and other plugins are not supported. Currently, enabling the Flash plugin results in a compromised user experience across Firefox for mobile

System Requirements

Firefox is available for Android 2.1 and higher.

Firefox requires 512 MB of RAM and around 17 MB of storage. However, Android 2.2 users can move Firefox and user data to the SD card using Android’s Settings app.

This release requires a phone with an ARMv7 processor. Before installing Firefox on your Android phone, visit the Platforms and Device Requirements page. See a full list of supported and unsupported devices by visiting our System Requirements wiki.


Download Firefox and Firefox by visiting on your Android phone or Nokia N900. On your Android phone, search the Android Market for "Firefox". Visit the Platforms and Device Requirements page to make sure your phone meets the system requirements.

Frequently Asked Questions

Is Firefox available for my phone?
Firefox is available for Android (2.1 or higher) phones with compatible hardware, and for the Nokia N900. See the Supported Devices page to see if Firefox is compatible with your Android device. You can download Firefox for Android and for the Nokia N900 at If Firefox for mobile is not available for your device or platform, we're continuing to investigate ways to bring parts of the Firefox experience to you. Learn more about our mobile projects.
How will Firefox keep me safe while I browse on my mobile?
Mozilla’s open source process leverages the experience of thousands of security experts around the globe, and Firefox includes features like HTTP Strict Transport Security, which lets Firefox work together with web site authors to protect you against eavesdropping and web forgery. Customizable security settings to manage passwords, cookies, loading images and installing add-ons give you complete control over your browsing experience. Learn more.
How do I use the Firefox user interface to browse the Web?
To save space on your phone’s display, Firefox browser controls are stowed away to the sides of the screen. Swipe right to access your tabs on the left side of the screen. Swipe left to view one-touch bookmarking, back and forward, and access your browser tools. To let you see more of the Web site, your browser controls and Awesome Bar get stowed away out of view. when you scroll down a Web page, but they instantly reappear if you pan to either side. Tap on the on Web site icon to the left of the Awesome Bar to open the Site Menu and manage your relationship with the current web page.
What is the Awesome Screen?
The Awesome Screen pops up just by tapping on the location bar. It instantly brings up a smart list of your favourite history items and bookmarks and lets you easily select a search engine for your desired search. You can also customize your search engine list for maximum efficiency.
How do I zoom in and out?
For Android phones, pinch to zoom in and out, or double-tap. For the Nokia N900, you can use the volume button on the top of your phone, or double tap the screen with your finger to zoom in and out. Also, on the Nokia N900, Ctrl-up and Ctrl-down arrows will zoom in and out.
How do I bookmark a web page?
Go to the site you wish to bookmark. Touch the bookmark “star” button on the right side of your display.
How do I open a new tab?
Touch the new tab "plus" button on the left side of your display screen to open a new tab. Tabs appear as thumbnails so you can easily see which page you’d like to select.
What are Firefox Add-ons and how can I get them on my mobile device?
Add-ons are small pieces of software that let you add or change the look or functionality of Firefox. Install add-ons directly to your Firefox by swiping to the left and tapping on the browser tools "gear" button on the bottom right-hand side of your screen, then choosing the add-ons “puzzle piece” button to discover and install the add-ons that are most useful to you.
How can I share my Firefox bookmarks, history, tabs, and passwords between my desktop and my mobile?
Firefox Sync is a built-in feature of Firefox that lets you synchronize your desktop and mobile data. To use this feature, you must first install Firefox for the desktop (version 4 or higher). Then go to Tools, Set Up Sync and follow the prompts to create a Sync Account. Once you have an account on your desktop, go to Firefox on your mobile phone, tap on Browser Tools button. Scroll down the Preferences pane and tap Connect under the Sync section. A one-time code will appear. Go back to your Sync account info, select “Add Device” and enter the code from your phone. Learn more about setting up Firefox Sync on your mobile.
Do I need to setup Firefox Sync to use Firefox on my phone?
No. Although we think Firefox Sync is highly useful, it is feature that you can choose to use or not. The Awesome Screen will start to get to know you and take you to your favorite parts of the Web with minimal typing, even without Firefox Sync.
What are the trade-offs to using Firefox Sync in Firefox?
Although we think Firefox Sync is highly useful, it is still in its experimental phase. Those who use Firefox Sync and who have large desktop profiles, may detect performance issues on their mobile. We are working to resolve this in future releases.
What is Location-Aware Browsing? Is Firefox tracking where I am?
Location-Aware Browsing saves you time by allowing websites to ask you where you are. If you choose to share your location with a website, it can use that information to find nearby points of interest and return additional, useful data like maps of your area. It’s all optional – Firefox doesn’t share your location without your permission. Learn more about Location-Aware Browsing.

Developer Questions

Will a Firefox add-on I built for the PC work on mobile? If not, do I need to change it?
Although Firefox for the desktop and mobile are built on the same technology platform, there are differences that will require developers to make changes to their add-ons in order to be compatible with Firefox for mobile. Visit the Mobile Developer Network and Electrolysis and Add-ons wiki to learn more.
What browser engine does Firefox use?
The desktop and mobile versions of Firefox both use the Gecko rendering engine. The mobile version of Firefox uses Gecko version 6, which is the best performing browser engine Mozilla has ever released and includes exciting features such as radically improved JavaScript performance, geolocation support, worker threads, and much more.
What JavaScript engine does Firefox use?
Firefox includes the new “JaegerMonkey” JavaScript engine, an advanced JIT (“just in time”) compiler using tracing technology. The JaegerMonkey engine makes Web applications faster by compiling code as you execute it, allowing many types of CPU-intensive applications to run at near-native speed.
How do I develop a Location-Aware website for Firefox?
Firefox has implemented the first public draft of the Geolocation specification from the W3C. An overview on how to develop Location-Aware websites here.
Does Firefox on my mobile support HTML 5?
HTML 5 is the next major revision of HTML. The HTML 5 specification is ongoing, but there are several HTML 5 and related features that will enable Web developers to create more innovative websites and applications. Firefox includes important features like Location-Aware browsing, the <canvas> and <svg> tags, Web workers and offline storage.
Does Firefox on my phone support plugins?
There is currently no plugin support in Firefox for Android, and plugins are disabled in Firefox for Nokia N900. On most Web pages that use the Adobe Flash plugin, the performance of the plugin on Nokia N900 didn't meet our standards, and the interactivity and performance of the entire Web page was negatively impacted. This was especially felt on pages with multiple instances of the plugin. Advanced users can enable plugins in Firefox for Nokia N900 for experimentation and testing only.
How can I get involved?
If you’d like to learn more about ways you can get involved in other mobile-related initiatives, check out our Get Involved page. As always, your input is welcome.

View the Firefox FAQ.