It looks like bug 1305490 introduced a regression that caused Farmville 2 game on Facebook to no longer render its contents on screen. STR: Visit https://apps.facebook.com/farmville-two/ on a system with Flash plugin installed. Observed: The page stays white while the background music starts playing. Expected: The game screen should show up along with a game loading bar while the music plays back. Attached a bisection log, which points to https://bugzilla.mozilla.org/show_bug.cgi?id=1305490

Sotaro, the other bug suggests you'd know about this stuff. Could you take a peek?

(For reference, there is another related regression regarding the same page, which affects Firefox 50 64-bit, at https://bugzilla.mozilla.org/show_bug.cgi?id=1317995. That has since been fixed)

Marking as major, since we need to make sure that this will not reach a stable channel (FF 52 due out on 2017-03-07), Farmville 2 has a very large audience.

On master, I reproduce the problem. It was addressed by applying Bug 1317131. bug 1305490 introduced another Bug 1311952. It was already addressed. Similar bug was introduced recently by Bug 1160157. It is going to be addressed by Bug 1317131.

So are we good now that bug 1317131 is landed? Jukka, can you verify?

Stefan, can your team confirm that this issue no longer reproduces? You'll want to confirm that you can see the problem in an older affected builds and not on newer ones that have the fix from bug 1317131.

We have checked the issue on all windows and it's working fine. We can see the issue on older build and we didn't see it on newer ones. However, the Farmville is not working on Ubuntu 16.04 amd64.

Sorry for the delay, was two weeks on PTO. Verified the fix to work on Lenovo Thinkpad X1 Yoga Windows 10 Pro Firefox Nightly 53.0a1 (2016-12-03) (64-bit) Adobe Flash 23.0.0.207 The Unconfirmed status should only be applied to bugs that have not ever been able to be reproduced. This bug was independently verified by Sotaro in comment 4 and by Stefan in comment 7, so this should be resolved as fixed rather than being reverted to Unconfirmed. In general, bugs already acknowledged as New should never be reverted to Unconfirmed unless all the authors who were able to reproduce in the first place have lost view of the bug. Great work Sotaro!