⚠️ **Warning**: Replacing a _Fennec_ (Firefox for Android) installation with _Fenix_ (Firefox Preview) can (and at the time of writing this definitely **will**) result in **DATA LOSS**. Do not replace an installation of Fennec (Firefox for Android) that contains data you do not want to risk losing (e.g. open tabs, history, bookmarks, top sites, ..).
## Release
The following links point to the latest *Fenix* (Firefox Preview) builds (Nightly; from `main`) that are setup to **replace** a *Fennec* (Firefox for Android) release version (`org.mozilla.firefox`).
The following links point to the latest *Fenix* (Firefox Preview) builds (Nightly; from `main`) that are setup to **replace** a *Fennec Beta* (Firefox for Android - Beta) release version (`org.mozilla.firefox.beta`).
The following links point to the latest *Fenix* (Firefox Preview) builds (Nightly; from `main`) that are setup to **replace** a *Fennec Nightly* (Firefox for Android - Nightly) release version (`org.mozilla.fennec_aurora`).
* **2019-09-05** - The first [migration builds](https://tools.taskcluster.net/index/project.mobile.fenix.v2.fennec-production/latest) are available now. A Firefox for Android (release) installation can be replaced with them. No actual migration code is in those builds yet. The replaced build is a "clean" Fenix installation.
* **2019-10-22** - First iteration of migration code to migrate history, bookmarks and open tabs landed in builds.
* **2019-11-02** - Firefox Account users remain logged in after migrating to Fenix.
## Development
When working on migration code it is helpful to have a local Fennec build and a local Fenix build that can replace the Fennec build. The following manual setup is needed to achieve that.
In the example commands below, we assume you are replacing a **Fennec Nightly** build with a **Fenix Nightly** build.
Now select the `geckoNightlyFennecNightly` build variant in Android Studio and deploy it. This build should have replaced your Fennec build now.
## Sample browser
When working on migration code that lives in the [Android Components repository](https://github.com/mozilla-mobile/android-components) it can be helpful to replace a local Fennec build with the sample browser (instead of Fenix). The following setup is needed for that.
Add the sharedUserId to the AndroidManifest.xml of sample browser:
Modify the application id in `build.gradle` of the `samples-browser` module and use a versionCode that is higher than your Fennec build (`2100000000` is the highest allowed version code and therefore should always work).
Click on "Sync Project with Gradle Files" and deploy the sample browser. This build should have replaced your Fennec build now.
## Emulator snapshots
When testing migration code the following process has to be repeated multiple times:
* (1) Uninstall an already existing Fennec/Fenix installation
* (2) Install Fennec
* (3) Use Fennec to create the necessary data for testing the migration
* (4) Install Fenix
* (5) Debug / Test
Steps (1) to (3) can be quite time consuming. Emulator snapshots can help with that:
* Launch an emulator and perform steps 1 to 3. You may need to modify your Fennec build to create an X86 build for your emulator (target `i686-linux-android`).
* Click on the three dot menu in the emulator toolbar and select "Snapshots". Press the "Take Snapshot" button. If needed give you snapshot a descriptive name in case you will need to have multiple "test snapshots".
* With the "Play" button you can always reset your emulator to that state and repeat the migration process.
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