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Showing content from https://support.mozilla.org/en-US/kb/make-firefox-default-browser-android below:

You can set Firefox as your default browser on your Android device.

Android version 10 and newer

Tap the menu button
Tap .
Tap the Set as default browser toggle.
The Set Firefox as your default browser app? screen displays.
Tap the Firefox radio button.
Tap Set as default.

Android version 7, 8 and 9

Tap the menu button
Tap .
Tap the Set as default browser toggle.
The DEFAULT DEVICES screen displays.
Tap .
The BROWSER APP screen displays.
Tap the Firefox radio button.

Android version 6

In the Settings menu on your device, tap Apps & notifications (it may be called Apps or Applications on some versions of Android).
Tap (you may have to tap on the icon first on some versions of Android).
Tap .
Tap to open a list of choices.
Tap Firefox to select it.

Android version 5 and older Step 1: Clear the current browser that opens links

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.
Tap on the All tab.
Tap on the current browser that opens links.

This is usually the default browser, which is called "Browser" or "Internet".
Tap on Clear defaults to prevent this browser from opening links by default.

If you haven't installed another browser, or you have installed another browser like Opera and set it as your default browser, then Clear defaults will be grayed out. If you have installed another browser, go back to the previous step and repeat with the default browser.