Environment: Device: Nexus 6 (Android 7.1.1); Build: Nightly 55.0a1 (2017-03-30); Prerequisite: Custom tab enabled in Nightly Settings; Steps to reproduce: 1. Open a Nightly custom tab; 2. Change device orientation from landscape to portrait a couple of times. Expected result: Nightly custom tab display the page with no issues. Actual result: Nightly custom tab is displaying a blank page for 1-2 sec after the orientation is changed. Notes: Not reproducible on Chrome.

The symptom is related to native gecko design. suggest to remove this bug from MVP scope( phase1 delivery) Hi Joe, Could you please share your ideas about this bug per PM's perspective? Thank you very much !!

I am not sure the issue is due to native gecko or java side architecture. I think the first step we should put more time on GeckoApp.java to find the root cause.

The blank page is still displayed 1-2 sec after the device is changing orientation on latest Nightly. Tested with HTC 10 (Android 7.0) and Huawei MediaPad M2 (Android 5.1.1).

per team's meeting last week, this needs to be fixed for the custom tab feature release. thanks

Wild guess: The custom tab manifest declaration (https://dxr.mozilla.org/mozilla-central/source/mobile/android/base/AndroidManifest.xml.in#314) doesn't include any config change handling (compare https://dxr.mozilla.org/mozilla-central/rev/8e969cc9aff49f845678cba5b35d9dd8aa340f16/mobile/android/base/AndroidManifest.xml.in#65 and https://dxr.mozilla.org/mozilla-central/rev/8e969cc9aff49f845678cba5b35d9dd8aa340f16/mobile/android/base/WebAppManifestFragment.xml.frag.in), so on rotation the activity is completely destroyed and recreated.

Comment on attachment 8861139 [details] Bug 1352108 - Add missing attributes to custom tab activity declaration. https://reviewboard.mozilla.org/r/133092/#review135908

Pushed by mozilla@buttercookie.de: https://hg.mozilla.org/integration/autoland/rev/cf585ad6f208 Add missing attributes to custom tab activity declaration. r=sebastian

Verified as fixed on latest Nightly build 55.0a1 from 2017-05-08; Devices: Honor 8 (Android 6.0) and Asus ZenPad 8(Android 6.0.1). Blank page when device is changing orientation isn't displayed on CustomTabActivity.