On the app info page have you tried setting change system settings to allowed. After that scroll to the top, tap on defaults. A new page should open with the option to clear defaults. Now it should ask which browser app you want to use each time.
Open up the Google Play Store.
Search for "browser" and choose to install a browser you have no interest in using.
After installation, open that browser - it should prompt to be the Default Browser.
Choose to make it the Default.
Now, quit the browser.
Go to Play Store and Un-install it.
Okay, so now, your phone does not have a Default browser set. 👍
Not really so easy. 😃
That doesn't work.
The default just reverts to Chrome, which you can't uninstall. You can only disable it. And that's one I'd prefer to be among the choices. 👎