Android version 10 and newer

1. Tap the menu button
   
2. Tap Settings.
3. Under the General section, search for the Set default browser option
4. Tap the toggle next to Set as default browser to turn it on.
5. Select Firefox from the listed browsers.

All set! From now on Firefox is your default browser.

Android version 7, 8 and 9

1. Tap the menu button
   
2. Tap Settings.
3. Tap the Set as default browser toggle.
   The DEFAULT DEVICES screen displays.
4. Tap Browser app.
   The BROWSER APP screen displays.
5. Tap the Firefox radio button.

Android version 6

1. In the Settings menu on your device, tap Apps & notifications (it may be called Apps or Applications on some versions of Android).
2. Tap Advanced (you may have to tap on the icon first on some versions of Android).
3. Tap Default apps.
4. Tap Browser app to open a list of choices.
5. Tap Firefox to select it.

Android version 5 and older

Step 1: Clear the current browser that opens links

1. Open the Settings application and tap on Apps.

   On some versions of Android, this button is labeled Applications or Application manager and you may have to tap on Manage applications before the next step.

2. Tap on the All tab.

   

3. Tap on the current browser that opens links.

   This is usually the default browser, which is called "Browser" or "Internet".

4. Tap on Clear defaults to prevent this browser from opening links by default.

Step 2: Set Firefox for Android to be the default browser for opening links

1. Open a link in an Android application, like the Mail application.
2. Tap on Firefox and then tap on Always.