I Request you to Answer me a Question that:
Can GeckoView by Mozilla, be used as the Default WebView Implementation on Rooted Android_Device(s). If yes, How?
Not sure about GeckoView, but if you just want to replace your stock WebView with something that’s probably more secure, you can use Bromite’s WebView instead:
Just carefully read the link you just gave:
GeckoView serves a similar purpose to Android’s built-in WebView, but it has its own APIs and is not a drop in replacement.
So answer is NO