Firefox Focus crashes after uninstalling Google WebView I uninstall Android System WebView with adb shell using the following commands.

pm uninstall com.google.android.webview
pm uninstall --user 0 com.google.android.webview


Now, when I launch Firefox Focus and type any website to visit, it crashes and shows the warning, but the normal Firefox Browser works without any issue.



Question: Though Play Store shows "Android WebView is a system component powered by Chrome", does Firefox Focus (FF) depend on that Android WebView? Can FF be run without WebView as normal Firefox?
TL;DR: As of Oct 2018, FireFox Focus now uses the GeckoView engine for rendering

TL;DR: Yes FireFox Focus depends on the Android System WebView with plans to switch to GeckoView when its ready. So NO you can't remove the Android System WebView and expect the app to work (as of Jan 2018).

So Firefox Focus is an open source project:

https://github.com/mozilla-mobile/focus-android

Looking at the project, there isn't much code there but does pull a library called: 

geckoview-latest.arr

From what I can tell from this mailing list post (after following a few links from the main page README):

https://mail.mozilla.org/pipermail/firefox-focus-public/2017-October/000018.html

and this issue:

https://github.com/mozilla-mobile/focus-android/issues/13

states that the team started the Firefox Focus project using Android's WebView while waiting for GeckoView to reach Minimum Viable Product (MVP).

https://bugzilla.mozilla.org/show_bug.cgi?id=1322573

The fact that not everything in the Depends On list is crossed off means that GeckoView is a work in progress.