Environment: Device: Nexus 6 (Android 6.0.1) Build: https://people.mozilla.org/~schien/fennec-52.0a1.en-US.android-arm.apk Chromecast + TV Steps to reproduce(intermittent): 1. Load http://w3c-test.org/presentation-api/controlling-ua/reconnectToPresentation_error-manual.html 2. Wait a couple of minutes 3. Tap back; open a new tab and load a webpage Expected result: User is taken to the previous page; the page load without any issue Actual result: User is not taken to the previous page, back has no action; the page doesn't load, there is no progress bar displayed Workaround: Clear all Fennec data from Apps android settings PS: Please see the attached logs

Tracking 52+ for this issue since this prevents page load.

Adjusting flags as it was mentioned that this was tested in a local build and it was proposed to be in 52.

https://pastebin.mozilla.org/8924099 Issue still reproducing with https://people-mozilla.org/~schien/presentation-api/presentation-api-eng-build.apk

Fennec stopped working: https://pastebin.mozilla.org/8924101