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A fast and secure browser for standalone virtual-reality and augmented-reality headsets.
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Firefox Reality

The goal of the Firefox Reality project is to create a full-featured browser exclusively for standalone AR and VR headsets.

You can find us on Twitter @MozillaReality and at

Task Status Build results

Bleeding-edge developer APKs

  1. Load this TaskCluster URL.
  2. Click the Firefox Reality for Android - Build - Master update → link.
  3. Click the Run Artifacts tab, and click to download the APK for your platform of choice.


Whenever a new string is added to a localizable strings file (strings.xml ,localpages.xml, ...) a string description must be provided as a comment above the new string. Also the project STRs wiki page must be updated with a key description, steps to reproduce and the expected results. The L10n wiki page can be found here.

Setup instructions

Make sure you are using Android NDK r17b.

Clone FirefoxReality.

git clone
cd FirefoxReality

Clone the third-party repo.

If you're developing for the Oculus, Snapdragon VR, or VIVE, you need to clone the repo with third-party SDK files.

git clone third_party

This repo is only available to Mozilla employees. If you have access to the relevant SDK but not this repo, you can manually place them here:

  • third_party/ovr_mobile/ for Oculus (should contain a VrApi folder)
  • third_party/svr/ for Snapdragon (should contain a libs folder, among other things)
  • third_party/wavesdk/ for Vive (should contain a build folder, among other things)

The repo in third_party can be updated like so:

pushd third_party && git fetch && git rebase origin/master && git checkout origin/master && popd

Fetch Git submodules.

You may need to set up two-factor authentication for the command line.

git submodule update --init --recursive

You can build for different devices:

  • oculusvr: Samsung Gear VR & Oculus Go
  • svr: Qualcomm & ODG glasses
  • wavevr: VIVE Focus

These devices are for only testing:

  • googlevr: Google Daydream
  • noapi: Runs on standard Android phones without a headset

Building for Oculus Mobile, SVR, and WaveVR requires access to their respective SDKs which are not included in this repo.

If you want to build FirefoxReality for Google Daydream (googlevr), you need to run:

cd gvr-android-sdk && ./gradlew :extractNdk

The command line version of gradlew requires JDK 8 from Oracle. If you see an error that Gradle doesn't understand your Java version, check which version of you're using by running java -showversion or java -version. You're probably using JDK 9 or 10, which won't work.

If you get an error extracting the NDK, you might need to copy the file from the top-level project directory into the gvr-android-sdk directory. If this file doesn't exist at the top-level directory either, open the top-level directory in Android Studio, and it should be created.

Open the project with Android Studio then build and run it. Depending on what you already have installed in Android Studio, the build may fail and then may prompt you to install dependencies. Just keep doing as it suggests. To select the device to build for, go to Tool Windows > Build Variants and select a build variant corresponding to your device.

If you run the APK on an Android device outside of Daydream or Gear VR, it will run in flat mode. To run in VR, put the device into a headset, and run the app from the VR launcher.

Unfortunately, for mobile-clip-in VR viewers, the APK isn't yet published in the Google Play Store because of known performance issues and bugs. The APK currently available is for only standalone Daydream headsets.

If you want to build FirefoxReality for WaveVR SDK:

Download the VIVE Wave SDK from the VIVE Developer Resources, and unzip it. Then, from the top-level project directory, run:

mkdir -p third_party/wavesdk
cp /path/to/the/sdk/2.0.32/SDK/libs/wvr_client.aar third_party/wavesdk
cp ./extra/wavesdk/build.gradle ./third_party/wavesdk

Make certain to set the build flavor to wavevrDebug in Android Studio before building the project.

Using a custom GeckoView

Create a file called in the top-level project directory. Add a variable called geckoViewLocalArm and geckoViewLocalX86 and set it to the location of your locally built AAR:


Install dev and production builds on device simultaneously

You can enable a dev applicationID sufix to install both dev and production builds simultaneously. You just need to add this property to your file:


Locally generate Android release builds

Local release builds can be useful to measure performance or debug issues only happening in release builds. Insead of dealing with release keys you can make the testing easier just adding this property to your file:


Note: the release APKs generated with a debug keystore can't be used for production.

Compress assets

ETC2 compression is used to improve performance and memory usage. Raw assets are placed in the uncompressed_assets folder. You can generate the compressed textures using the compressor utility in tools/compressor. You need to set up etc2comp and make it available on your PATH before running the script. Run this command to generate the compressed assets:

cd tools/compressor
npm install
npm run compress

Development troubleshooting

Device supports , but APK only supports armeabi-v7a[...]

Enable usb debugging on the device.

Could not get unknown property 'geckoViewLocal' for build 'FirefoxReality'[...]

./mach build
./mach package
./mach android archive-geckoview
find $objdir -name *.aar
echo "geckoViewLocalArm=$objdir/gradle/build/mobile/android/geckoview/outputs/aar/geckoview-official-withGeckoBinaries-noMinApi-release.aar" > $FirefoxReality/

Firefox > Web Developer > WebIDE > Performance gets stuck with greyed out "stop and show profile"

Restart FxR and close and re-open the WebIDE page.

Debugging tips

  • When using the native debugger you can ignore the first SIGSEGV: address access protected stop in GV thread. It's not a crash; you can click Resume to continue debugging.
  • On some platforms such as Oculus Go the native debugger stops on each input event. You can set this LLDB post-attach command in Android Studio to fix the problem: pro hand -p true -s false SIGILL
  • You can use adb shell am start -a android.intent.action.VIEW -d "" org.mozilla.vrbrowser/org.mozilla.vrbrowser.VRBrowserActivity to load a URL from the command line
  • You can use adb shell am start -a android.intent.action.VIEW -n org.mozilla.vrbrowser/org.mozilla.vrbrowser.VRBrowserActivity -e homepage "" to override the homepage
  • You can use adb shell setprop debug.oculus.enableVideoCapture 1 to record videos on the Oculus Go. Remember to disable it when your video is ready.
  • You can set disableCrashRestart=true in the gradle to disable app relaunch on crash.

Experimental Servo support

To compile with Servo support, create a file called in the top-level project directory and add enableServo=1. Then to enable Servo in Firefox Reality, go the Developer Options panel in the Settings, and toggle the Servo option. Then a new button will be added to the navigation bar. Clicking that button will reload the current page with Servo.

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