Starting with iOS 14, Apple now allows you to change the default browser on your iOS device, to use this feature you need to be using Firefox for iOS version 28.2 or higher.

On older versions, you cannot change the default browser but you can send pages from Safari to Firefox.

Set Firefox as default browser (requires iOS 14)

Revision id: 208076
Created: Sep 20, 2020, 11:16:55 AM
Creator: Chris Ilias
Comment: added note about rebooting device resetting the default browser
Reviewed: No
Ready for localization: No

To set Firefox as the default browser on your iOS device, you must must have iOS 14 (or higher) and Firefox for iOS version 28.2 (or higher).

Visit the App Settings for the Firefox app. This can be found by going to Settings and then scroll down until you see Firefox in the list of apps.
Under ALLOW FIREFOX TO ACCESS, tap Default Browser App and select Firefox.
iOS will prompt to confirm that websites or email addresses will be opened in Firefox, this disappears once you confirm it the first time.

If you restart your device, iOS 14 will reset the Default Browser App setting. Apple is expected to fix this in a future update. Until then, remember to repeat the steps above if you restart your device.

Older versions of iOS

If you're on an older version of iOS (pre-14), Apple does not allow changing the default browser on older versions but you can try the following workaround:

Send pages from Safari to Firefox

From Safari, tap the share icon at the bottom of the screen to bring up the share menu. (Note: You can also long-press on a link on a page to bring up the share menu.)
Choose Firefox as the destination in the share menu.
If Firefox is not listed in the options, tap the More button in the first row of the share menu.
Tap the switch next to Firefox to enable it.