Since a couple of days we are experiencing a major outage of Firefox which gets rendered as a completely white window on OS X 10.6. So over on bug 972891 which is about a crash for the recently backed-out MOZCRASH line, Bill asked me for details as what can be seen on OS X 10.6. So I checked with a debug build of his inbound push: [58727] WARNING: Couldn't init gGlobalContext.: file /builds/slave/m-in-osx64-d-00000000000000000/build/gfx/gl/GLContextProviderCGL.mm, line 284 2014-02-17 01:51:26.707 firefox[58727:8313] invalid pixel format 2014-02-17 01:51:26.707 firefox[58727:8313] invalid context [58727] WARNING: Failed to create CompositorOGL context: file /builds/slave/m-in-osx64-d-00000000000000000/build/gfx/layers/opengl/CompositorOGL.cpp, line 174 ERROR: Changing compositor from 2 to 1. As of now this blocks all of our testing for Firefox 30.0 on OS X 10.6.

Here the details of our OS X 10.6 machines: Model Name: Mac mini Model Identifier: Macmini4,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.4 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 3 MB Memory: 8 GB Chipset Model: NVIDIA GeForce 320M Type: GPU Bus: PCI VRAM (Total): 256 MB Vendor: NVIDIA (0x10de) Device ID: 0x08a4 Revision ID: 0x00a2 ROM Revision: 3546 Displays: Display Connector: Display Connector:

This is a regression from bug 960783 since when the browser.tabs.remote preference is set to true. Starting Firefox with the pref set to false all looks fine.

What happens when you set layers.offmainthreadcomposition.force-basic to false?

True, of course! Do you have anything not as the default under layers.* ?

The above is tested with a fresh profile, so you can assume no user_prefs are set regarding to e10s and layers.

See bug 974007 for an explanation of we're broken for non-e10s windows with browser.tabs.remote=true (the default now). I assume it's also broken in e10s windows, which needs to be fixed too.

Matt, do you think this needs tracking at this point if so could you provide some more details on impact to users.

This should be fixed now.

Andreea, given that Henrik is on PTO can you please confirm this is resolved?

Took latest Nightly on a 10.6 OS X machine and it works fine, browser.tabs.remote preference being set to true and browser.tabs.remote.autostart to false, by default.